xref: /external/chromium_org/content/renderer/render_view_impl.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/render_view_impl.h"

#include <algorithm>
#include <cmath>

#include "base/auto_reset.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/debug/alias.h"
#include "base/debug/trace_event.h"
#include "base/files/file_path.h"
#include "base/i18n/rtl.h"
#include "base/json/json_writer.h"
#include "base/lazy_instance.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/metrics/histogram.h"
#include "base/path_service.h"
#include "base/process/kill.h"
#include "base/process/process.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/sys_string_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "cc/base/switches.h"
#include "content/child/appcache/appcache_dispatcher.h"
#include "content/child/appcache/web_application_cache_host_impl.h"
#include "content/child/child_thread.h"
#include "content/child/npapi/webplugin_delegate_impl.h"
#include "content/child/request_extra_data.h"
#include "content/child/webmessageportchannel_impl.h"
#include "content/common/clipboard_messages.h"
#include "content/common/database_messages.h"
#include "content/common/dom_storage/dom_storage_types.h"
#include "content/common/drag_messages.h"
#include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
#include "content/common/input_messages.h"
#include "content/common/java_bridge_messages.h"
#include "content/common/pepper_messages.h"
#include "content/common/socket_stream_handle_data.h"
#include "content/common/ssl_status_serialization.h"
#include "content/common/view_messages.h"
#include "content/public/common/bindings_policy.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/context_menu_params.h"
#include "content/public/common/drop_data.h"
#include "content/public/common/favicon_url.h"
#include "content/public/common/file_chooser_params.h"
#include "content/public/common/page_zoom.h"
#include "content/public/common/ssl_status.h"
#include "content/public/common/three_d_api_types.h"
#include "content/public/common/url_constants.h"
#include "content/public/common/url_utils.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/public/renderer/context_menu_client.h"
#include "content/public/renderer/document_state.h"
#include "content/public/renderer/history_item_serialization.h"
#include "content/public/renderer/navigation_state.h"
#include "content/public/renderer/render_view_observer.h"
#include "content/public/renderer/render_view_visitor.h"
#include "content/public/renderer/web_preferences.h"
#include "content/renderer/accessibility/renderer_accessibility.h"
#include "content/renderer/accessibility/renderer_accessibility_complete.h"
#include "content/renderer/accessibility/renderer_accessibility_focus_only.h"
#include "content/renderer/browser_plugin/browser_plugin.h"
#include "content/renderer/browser_plugin/browser_plugin_manager.h"
#include "content/renderer/browser_plugin/browser_plugin_manager_impl.h"
#include "content/renderer/context_menu_params_builder.h"
#include "content/renderer/devtools/devtools_agent.h"
#include "content/renderer/disambiguation_popup_helper.h"
#include "content/renderer/dom_automation_controller.h"
#include "content/renderer/dom_storage/webstoragenamespace_impl.h"
#include "content/renderer/drop_data_builder.h"
#include "content/renderer/external_popup_menu.h"
#include "content/renderer/fetchers/alt_error_page_resource_fetcher.h"
#include "content/renderer/geolocation_dispatcher.h"
#include "content/renderer/gpu/render_widget_compositor.h"
#include "content/renderer/idle_user_detector.h"
#include "content/renderer/image_loading_helper.h"
#include "content/renderer/ime_event_guard.h"
#include "content/renderer/input/input_handler_manager.h"
#include "content/renderer/input_tag_speech_dispatcher.h"
#include "content/renderer/internal_document_state_data.h"
#include "content/renderer/java/java_bridge_dispatcher.h"
#include "content/renderer/load_progress_tracker.h"
#include "content/renderer/media/audio_device_factory.h"
#include "content/renderer/media/audio_renderer_mixer_manager.h"
#include "content/renderer/media/media_stream_dependency_factory.h"
#include "content/renderer/media/media_stream_dispatcher.h"
#include "content/renderer/media/media_stream_impl.h"
#include "content/renderer/media/midi_dispatcher.h"
#include "content/renderer/media/render_media_log.h"
#include "content/renderer/media/video_capture_impl_manager.h"
#include "content/renderer/media/webmediaplayer_impl.h"
#include "content/renderer/media/webmediaplayer_ms.h"
#include "content/renderer/media/webmediaplayer_params.h"
#include "content/renderer/mhtml_generator.h"
#include "content/renderer/notification_provider.h"
#include "content/renderer/render_frame_impl.h"
#include "content/renderer/render_process.h"
#include "content/renderer/render_thread_impl.h"
#include "content/renderer/render_view_impl_params.h"
#include "content/renderer/render_view_mouse_lock_dispatcher.h"
#include "content/renderer/render_widget_fullscreen_pepper.h"
#include "content/renderer/renderer_webapplicationcachehost_impl.h"
#include "content/renderer/renderer_webcolorchooser_impl.h"
#include "content/renderer/resizing_mode_selector.h"
#include "content/renderer/savable_resources.h"
#include "content/renderer/shared_worker_repository.h"
#include "content/renderer/speech_recognition_dispatcher.h"
#include "content/renderer/stats_collection_controller.h"
#include "content/renderer/stats_collection_observer.h"
#include "content/renderer/text_input_client_observer.h"
#include "content/renderer/v8_value_converter_impl.h"
#include "content/renderer/web_ui_extension.h"
#include "content/renderer/web_ui_extension_data.h"
#include "content/renderer/websharedworker_proxy.h"
#include "media/audio/audio_output_device.h"
#include "media/base/audio_renderer_mixer_input.h"
#include "media/base/filter_collection.h"
#include "media/base/media_switches.h"
#include "media/filters/audio_renderer_impl.h"
#include "media/filters/gpu_video_accelerator_factories.h"
#include "net/base/data_url.h"
#include "net/base/escape.h"
#include "net/base/net_errors.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "net/http/http_util.h"
#include "third_party/WebKit/public/platform/WebCString.h"
#include "third_party/WebKit/public/platform/WebDragData.h"
#include "third_party/WebKit/public/platform/WebHTTPBody.h"
#include "third_party/WebKit/public/platform/WebImage.h"
#include "third_party/WebKit/public/platform/WebMessagePortChannel.h"
#include "third_party/WebKit/public/platform/WebPoint.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/platform/WebSocketStreamHandle.h"
#include "third_party/WebKit/public/platform/WebStorageQuotaCallbacks.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/platform/WebURL.h"
#include "third_party/WebKit/public/platform/WebURLError.h"
#include "third_party/WebKit/public/platform/WebURLRequest.h"
#include "third_party/WebKit/public/platform/WebURLResponse.h"
#include "third_party/WebKit/public/platform/WebVector.h"
#include "third_party/WebKit/public/web/WebAXObject.h"
#include "third_party/WebKit/public/web/WebColorName.h"
#include "third_party/WebKit/public/web/WebColorSuggestion.h"
#include "third_party/WebKit/public/web/WebDOMEvent.h"
#include "third_party/WebKit/public/web/WebDOMMessageEvent.h"
#include "third_party/WebKit/public/web/WebDataSource.h"
#include "third_party/WebKit/public/web/WebDateTimeChooserCompletion.h"
#include "third_party/WebKit/public/web/WebDateTimeChooserParams.h"
#include "third_party/WebKit/public/web/WebDevToolsAgent.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElement.h"
#include "third_party/WebKit/public/web/WebFileChooserParams.h"
#include "third_party/WebKit/public/web/WebFindOptions.h"
#include "third_party/WebKit/public/web/WebFormControlElement.h"
#include "third_party/WebKit/public/web/WebFormElement.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebGlyphCache.h"
#include "third_party/WebKit/public/web/WebHelperPlugin.h"
#include "third_party/WebKit/public/web/WebHistoryItem.h"
#include "third_party/WebKit/public/web/WebInputElement.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "third_party/WebKit/public/web/WebMediaPlayerAction.h"
#include "third_party/WebKit/public/web/WebNavigationPolicy.h"
#include "third_party/WebKit/public/web/WebNodeList.h"
#include "third_party/WebKit/public/web/WebPageSerializer.h"
#include "third_party/WebKit/public/web/WebPlugin.h"
#include "third_party/WebKit/public/web/WebPluginAction.h"
#include "third_party/WebKit/public/web/WebPluginContainer.h"
#include "third_party/WebKit/public/web/WebPluginDocument.h"
#include "third_party/WebKit/public/web/WebRange.h"
#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "third_party/WebKit/public/web/WebSearchableFormData.h"
#include "third_party/WebKit/public/web/WebSecurityOrigin.h"
#include "third_party/WebKit/public/web/WebSecurityPolicy.h"
#include "third_party/WebKit/public/web/WebSerializedScriptValue.h"
#include "third_party/WebKit/public/web/WebSettings.h"
#include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
#include "third_party/WebKit/public/web/WebUserMediaClient.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "third_party/WebKit/public/web/WebWindowFeatures.h"
#include "third_party/WebKit/public/web/default/WebRenderTheme.h"
#include "ui/base/ui_base_switches_util.h"
#include "ui/events/latency_info.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/point.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/size_conversions.h"
#include "ui/shell_dialogs/selected_file_info.h"
#include "v8/include/v8.h"
#include "webkit/child/weburlresponse_extradata_impl.h"

#if defined(OS_ANDROID)
#include <cpu-features.h>

#include "content/common/android/device_telephony_info.h"
#include "content/common/gpu/client/context_provider_command_buffer.h"
#include "content/renderer/android/address_detector.h"
#include "content/renderer/android/content_detector.h"
#include "content/renderer/android/email_detector.h"
#include "content/renderer/android/phone_number_detector.h"
#include "content/renderer/android/synchronous_compositor_factory.h"
#include "content/renderer/media/android/renderer_media_player_manager.h"
#include "content/renderer/media/android/stream_texture_factory_android_impl.h"
#include "content/renderer/media/android/webmediaplayer_android.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/WebKit/public/platform/WebFloatPoint.h"
#include "third_party/WebKit/public/platform/WebFloatRect.h"
#include "third_party/WebKit/public/web/WebHitTestResult.h"
#include "ui/gfx/rect_f.h"

#if defined(GOOGLE_TV)
#include "content/renderer/media/rtc_video_decoder_bridge_tv.h"
#include "content/renderer/media/rtc_video_decoder_factory_tv.h"
#endif

#elif defined(OS_WIN)
// TODO(port): these files are currently Windows only because they concern:
//   * theming
#include "ui/native_theme/native_theme_win.h"
#elif defined(USE_X11)
#include "ui/native_theme/native_theme.h"
#elif defined(OS_MACOSX)
#include "skia/ext/skia_utils_mac.h"
#endif

#if defined(ENABLE_PLUGINS)
#include "content/renderer/npapi/webplugin_delegate_proxy.h"
#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
#include "content/renderer/pepper/pepper_plugin_registry.h"
#endif

#if defined(ENABLE_WEBRTC)
#include "content/renderer/media/rtc_peer_connection_handler.h"
#endif

using blink::WebAXObject;
using blink::WebApplicationCacheHost;
using blink::WebApplicationCacheHostClient;
using blink::WebCString;
using blink::WebColor;
using blink::WebColorName;
using blink::WebConsoleMessage;
using blink::WebContextMenuData;
using blink::WebCookieJar;
using blink::WebData;
using blink::WebDataSource;
using blink::WebDocument;
using blink::WebDOMEvent;
using blink::WebDOMMessageEvent;
using blink::WebDragData;
using blink::WebDragOperation;
using blink::WebDragOperationsMask;
using blink::WebElement;
using blink::WebExternalPopupMenu;
using blink::WebExternalPopupMenuClient;
using blink::WebFileChooserCompletion;
using blink::WebFindOptions;
using blink::WebFormControlElement;
using blink::WebFormElement;
using blink::WebFrame;
using blink::WebGestureEvent;
using blink::WebHistoryItem;
using blink::WebHTTPBody;
using blink::WebIconURL;
using blink::WebImage;
using blink::WebInputElement;
using blink::WebInputEvent;
using blink::WebMediaPlayer;
using blink::WebMediaPlayerAction;
using blink::WebMediaPlayerClient;
using blink::WebMouseEvent;
using blink::WebNavigationPolicy;
using blink::WebNavigationType;
using blink::WebNode;
using blink::WebPageSerializer;
using blink::WebPageSerializerClient;
using blink::WebPeerConnection00Handler;
using blink::WebPeerConnection00HandlerClient;
using blink::WebPeerConnectionHandler;
using blink::WebPeerConnectionHandlerClient;
using blink::WebPluginAction;
using blink::WebPluginContainer;
using blink::WebPluginDocument;
using blink::WebPoint;
using blink::WebPopupMenuInfo;
using blink::WebRange;
using blink::WebRect;
using blink::WebReferrerPolicy;
using blink::WebRuntimeFeatures;
using blink::WebScriptSource;
using blink::WebSearchableFormData;
using blink::WebSecurityOrigin;
using blink::WebSecurityPolicy;
using blink::WebSerializedScriptValue;
using blink::WebSettings;
using blink::WebSize;
using blink::WebSocketStreamHandle;
using blink::WebStorageNamespace;
using blink::WebStorageQuotaCallbacks;
using blink::WebStorageQuotaError;
using blink::WebStorageQuotaType;
using blink::WebString;
using blink::WebTextAffinity;
using blink::WebTextDirection;
using blink::WebTouchEvent;
using blink::WebURL;
using blink::WebURLError;
using blink::WebURLRequest;
using blink::WebURLResponse;
using blink::WebUserGestureIndicator;
using blink::WebVector;
using blink::WebView;
using blink::WebWidget;
using blink::WebWindowFeatures;
using base::Time;
using base::TimeDelta;
using webkit_glue::WebURLResponseExtraDataImpl;

#if defined(OS_ANDROID)
using blink::WebContentDetectionResult;
using blink::WebFloatPoint;
using blink::WebFloatRect;
using blink::WebHitTestResult;
#endif

namespace content {

//-----------------------------------------------------------------------------

typedef std::map<blink::WebView*, RenderViewImpl*> ViewMap;
static base::LazyInstance<ViewMap> g_view_map = LAZY_INSTANCE_INITIALIZER;
typedef std::map<int32, RenderViewImpl*> RoutingIDViewMap;
static base::LazyInstance<RoutingIDViewMap> g_routing_id_view_map =
    LAZY_INSTANCE_INITIALIZER;

// Time, in seconds, we delay before sending content state changes (such as form
// state and scroll position) to the browser. We delay sending changes to avoid
// spamming the browser.
// To avoid having tab/session restore require sending a message to get the
// current content state during tab closing we use a shorter timeout for the
// foreground renderer. This means there is a small window of time from which
// content state is modified and not sent to session restore, but this is
// better than having to wake up all renderers during shutdown.
const int kDelaySecondsForContentStateSyncHidden = 5;
const int kDelaySecondsForContentStateSync = 1;

const size_t kExtraCharsBeforeAndAfterSelection = 100;

const float kScalingIncrementForGesture = 0.01f;

#if defined(OS_ANDROID)
// Delay between tapping in content and launching the associated android intent.
// Used to allow users see what has been recognized as content.
const size_t kContentIntentDelayMilliseconds = 700;
#endif

static RenderViewImpl* (*g_create_render_view_impl)(RenderViewImplParams*) =
    NULL;

static void GetRedirectChain(WebDataSource* ds, std::vector<GURL>* result) {
  // Replace any occurrences of swappedout:// with about:blank.
  const WebURL& blank_url = GURL(kAboutBlankURL);
  WebVector<WebURL> urls;
  ds->redirectChain(urls);
  result->reserve(urls.size());
  for (size_t i = 0; i < urls.size(); ++i) {
    if (urls[i] != GURL(kSwappedOutURL))
      result->push_back(urls[i]);
    else
      result->push_back(blank_url);
  }
}

// If |data_source| is non-null and has an InternalDocumentStateData associated
// with it, the AltErrorPageResourceFetcher is reset.
static void StopAltErrorPageFetcher(WebDataSource* data_source) {
  if (data_source) {
    InternalDocumentStateData* internal_data =
        InternalDocumentStateData::FromDataSource(data_source);
    if (internal_data)
      internal_data->set_alt_error_page_fetcher(NULL);
  }
}

static bool IsReload(const ViewMsg_Navigate_Params& params) {
  return
      params.navigation_type == ViewMsg_Navigate_Type::RELOAD ||
      params.navigation_type == ViewMsg_Navigate_Type::RELOAD_IGNORING_CACHE ||
      params.navigation_type ==
          ViewMsg_Navigate_Type::RELOAD_ORIGINAL_REQUEST_URL;
}

// static
WebReferrerPolicy RenderViewImpl::GetReferrerPolicyFromRequest(
    WebFrame* frame,
    const WebURLRequest& request) {
  return request.extraData() ?
      static_cast<RequestExtraData*>(request.extraData())->referrer_policy() :
      frame->document().referrerPolicy();
}

// static
Referrer RenderViewImpl::GetReferrerFromRequest(
    WebFrame* frame,
    const WebURLRequest& request) {
  return Referrer(GURL(request.httpHeaderField(WebString::fromUTF8("Referer"))),
                  GetReferrerPolicyFromRequest(frame, request));
}

// static
WebURLResponseExtraDataImpl* RenderViewImpl::GetExtraDataFromResponse(
    const WebURLResponse& response) {
  return static_cast<WebURLResponseExtraDataImpl*>(
      response.extraData());
}

NOINLINE static void CrashIntentionally() {
  // NOTE(shess): Crash directly rather than using NOTREACHED() so
  // that the signature is easier to triage in crash reports.
  volatile int* zero = NULL;
  *zero = 0;
}

#if defined(ADDRESS_SANITIZER)
NOINLINE static void MaybeTriggerAsanError(const GURL& url) {
  // NOTE(rogerm): We intentionally perform an invalid heap access here in
  //     order to trigger an Address Sanitizer (ASAN) error report.
  static const char kCrashDomain[] = "crash";
  static const char kHeapOverflow[] = "/heap-overflow";
  static const char kHeapUnderflow[] = "/heap-underflow";
  static const char kUseAfterFree[] = "/use-after-free";
  static const int kArraySize = 5;

  if (!url.DomainIs(kCrashDomain, sizeof(kCrashDomain) - 1))
    return;

  if (!url.has_path())
    return;

  scoped_ptr<int[]> array(new int[kArraySize]);
  std::string crash_type(url.path());
  int dummy = 0;
  if (crash_type == kHeapOverflow) {
    dummy = array[kArraySize];
  } else if (crash_type == kHeapUnderflow ) {
    dummy = array[-1];
  } else if (crash_type == kUseAfterFree) {
    int* dangling = array.get();
    array.reset();
    dummy = dangling[kArraySize / 2];
  }

  // Make sure the assignments to the dummy value aren't optimized away.
  base::debug::Alias(&dummy);
}
#endif  // ADDRESS_SANITIZER

static void MaybeHandleDebugURL(const GURL& url) {
  if (!url.SchemeIs(chrome::kChromeUIScheme))
    return;
  if (url == GURL(kChromeUICrashURL)) {
    CrashIntentionally();
  } else if (url == GURL(kChromeUIKillURL)) {
    base::KillProcess(base::GetCurrentProcessHandle(), 1, false);
  } else if (url == GURL(kChromeUIHangURL)) {
    for (;;) {
      base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(1));
    }
  } else if (url == GURL(kChromeUIShorthangURL)) {
    base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(20));
  }

#if defined(ADDRESS_SANITIZER)
  MaybeTriggerAsanError(url);
#endif  // ADDRESS_SANITIZER
}

// Returns false unless this is a top-level navigation.
static bool IsTopLevelNavigation(WebFrame* frame) {
  return frame->parent() == NULL;
}

// Returns false unless this is a top-level navigation that crosses origins.
static bool IsNonLocalTopLevelNavigation(const GURL& url,
                                         WebFrame* frame,
                                         WebNavigationType type,
                                         bool is_form_post) {
  if (!IsTopLevelNavigation(frame))
    return false;

  // Navigations initiated within Webkit are not sent out to the external host
  // in the following cases.
  // 1. The url scheme is not http/https
  // 2. The origin of the url and the opener is the same in which case the
  //    opener relationship is maintained.
  // 3. Reloads/form submits/back forward navigations
  if (!url.SchemeIs(kHttpScheme) && !url.SchemeIs(kHttpsScheme))
    return false;

  if (type != blink::WebNavigationTypeReload &&
      type != blink::WebNavigationTypeBackForward && !is_form_post) {
    // The opener relationship between the new window and the parent allows the
    // new window to script the parent and vice versa. This is not allowed if
    // the origins of the two domains are different. This can be treated as a
    // top level navigation and routed back to the host.
    blink::WebFrame* opener = frame->opener();
    if (!opener)
      return true;

    if (url.GetOrigin() != GURL(opener->document().url()).GetOrigin())
      return true;
  }
  return false;
}

static void NotifyTimezoneChange(blink::WebFrame* frame) {
  v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
  v8::Context::Scope context_scope(frame->mainWorldScriptContext());
  v8::Date::DateTimeConfigurationChangeNotification(v8::Isolate::GetCurrent());
  blink::WebFrame* child = frame->firstChild();
  for (; child; child = child->nextSibling())
    NotifyTimezoneChange(child);
}

static WindowOpenDisposition NavigationPolicyToDisposition(
    WebNavigationPolicy policy) {
  switch (policy) {
    case blink::WebNavigationPolicyIgnore:
      return IGNORE_ACTION;
    case blink::WebNavigationPolicyDownload:
      return SAVE_TO_DISK;
    case blink::WebNavigationPolicyCurrentTab:
      return CURRENT_TAB;
    case blink::WebNavigationPolicyNewBackgroundTab:
      return NEW_BACKGROUND_TAB;
    case blink::WebNavigationPolicyNewForegroundTab:
      return NEW_FOREGROUND_TAB;
    case blink::WebNavigationPolicyNewWindow:
      return NEW_WINDOW;
    case blink::WebNavigationPolicyNewPopup:
      return NEW_POPUP;
  default:
    NOTREACHED() << "Unexpected WebNavigationPolicy";
    return IGNORE_ACTION;
  }
}

// Returns true if the device scale is high enough that losing subpixel
// antialiasing won't have a noticeable effect on text quality.
static bool DeviceScaleEnsuresTextQuality(float device_scale_factor) {
#if defined(OS_ANDROID)
  // On Android, we never have subpixel antialiasing.
  return true;
#else
  return device_scale_factor > 1.5f;
#endif

}

static bool ShouldUseFixedPositionCompositing(float device_scale_factor) {
  // Compositing for fixed-position elements is dependent on
  // device_scale_factor if no flag is set. http://crbug.com/172738
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(switches::kDisableCompositingForFixedPosition))
    return false;

  if (command_line.HasSwitch(switches::kEnableCompositingForFixedPosition))
    return true;

  return DeviceScaleEnsuresTextQuality(device_scale_factor);
}

static bool ShouldUseAcceleratedCompositingForOverflowScroll(
    float device_scale_factor) {
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(switches::kDisableAcceleratedOverflowScroll))
    return false;

  if (command_line.HasSwitch(switches::kEnableAcceleratedOverflowScroll))
    return true;

  return DeviceScaleEnsuresTextQuality(device_scale_factor);
}

static bool ShouldUseAcceleratedCompositingForScrollableFrames(
    float device_scale_factor) {
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(switches::kDisableAcceleratedScrollableFrames))
    return false;

  if (command_line.HasSwitch(switches::kEnableAcceleratedScrollableFrames))
    return true;

  if (!cc::switches::IsLCDTextEnabled())
    return true;

  return DeviceScaleEnsuresTextQuality(device_scale_factor);
}

static bool ShouldUseCompositedScrollingForFrames(
    float device_scale_factor) {
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(switches::kDisableCompositedScrollingForFrames))
    return false;

  if (command_line.HasSwitch(switches::kEnableCompositedScrollingForFrames))
    return true;

  if (!cc::switches::IsLCDTextEnabled())
    return true;

  return DeviceScaleEnsuresTextQuality(device_scale_factor);
}

static bool ShouldUseUniversalAcceleratedCompositingForOverflowScroll() {
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(
          switches::kDisableUniversalAcceleratedOverflowScroll))
    return false;

  if (command_line.HasSwitch(
          switches::kEnableUniversalAcceleratedOverflowScroll))
    return true;

  return false;
}

static bool ShouldUseTransitionCompositing(float device_scale_factor) {
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(switches::kDisableCompositingForTransition))
    return false;

  if (command_line.HasSwitch(switches::kEnableCompositingForTransition))
    return true;

  // TODO(ajuma): Re-enable this by default for high-DPI once the problem
  // of excessive layer promotion caused by overlap has been addressed.
  // http://crbug.com/178119.
  return false;
}

static bool ShouldUseAcceleratedFixedRootBackground(float device_scale_factor) {
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(switches::kDisableAcceleratedFixedRootBackground))
    return false;

  if (command_line.HasSwitch(switches::kEnableAcceleratedFixedRootBackground))
    return true;

  return DeviceScaleEnsuresTextQuality(device_scale_factor);
}

static FaviconURL::IconType ToFaviconType(blink::WebIconURL::Type type) {
  switch (type) {
    case blink::WebIconURL::TypeFavicon:
      return FaviconURL::FAVICON;
    case blink::WebIconURL::TypeTouch:
      return FaviconURL::TOUCH_ICON;
    case blink::WebIconURL::TypeTouchPrecomposed:
      return FaviconURL::TOUCH_PRECOMPOSED_ICON;
    case blink::WebIconURL::TypeInvalid:
      return FaviconURL::INVALID_ICON;
  }
  return FaviconURL::INVALID_ICON;
}

///////////////////////////////////////////////////////////////////////////////

struct RenderViewImpl::PendingFileChooser {
  PendingFileChooser(const FileChooserParams& p, WebFileChooserCompletion* c)
      : params(p),
        completion(c) {
  }
  FileChooserParams params;
  WebFileChooserCompletion* completion;  // MAY BE NULL to skip callback.
};

namespace {

class WebWidgetLockTarget : public MouseLockDispatcher::LockTarget {
 public:
  explicit WebWidgetLockTarget(blink::WebWidget* webwidget)
      : webwidget_(webwidget) {}

  virtual void OnLockMouseACK(bool succeeded) OVERRIDE {
    if (succeeded)
      webwidget_->didAcquirePointerLock();
    else
      webwidget_->didNotAcquirePointerLock();
  }

  virtual void OnMouseLockLost() OVERRIDE {
    webwidget_->didLosePointerLock();
  }

  virtual bool HandleMouseLockedInputEvent(
      const blink::WebMouseEvent &event) OVERRIDE {
    // The WebWidget handles mouse lock in WebKit's handleInputEvent().
    return false;
  }

 private:
  blink::WebWidget* webwidget_;
};

int64 ExtractPostId(const WebHistoryItem& item) {
  if (item.isNull())
    return -1;

  if (item.httpBody().isNull())
    return -1;

  return item.httpBody().identifier();
}

bool TouchEnabled() {
// Based on the definition of chrome::kEnableTouchIcon.
#if defined(OS_ANDROID)
  return true;
#else
  return false;
#endif
}

WebDragData DropDataToWebDragData(const DropData& drop_data) {
  std::vector<WebDragData::Item> item_list;

  // These fields are currently unused when dragging into WebKit.
  DCHECK(drop_data.download_metadata.empty());
  DCHECK(drop_data.file_contents.empty());
  DCHECK(drop_data.file_description_filename.empty());

  if (!drop_data.text.is_null()) {
    WebDragData::Item item;
    item.storageType = WebDragData::Item::StorageTypeString;
    item.stringType = WebString::fromUTF8(ui::Clipboard::kMimeTypeText);
    item.stringData = drop_data.text.string();
    item_list.push_back(item);
  }

  // TODO(dcheng): Do we need to distinguish between null and empty URLs? Is it
  // meaningful to write an empty URL to the clipboard?
  if (!drop_data.url.is_empty()) {
    WebDragData::Item item;
    item.storageType = WebDragData::Item::StorageTypeString;
    item.stringType = WebString::fromUTF8(ui::Clipboard::kMimeTypeURIList);
    item.stringData = WebString::fromUTF8(drop_data.url.spec());
    item.title = drop_data.url_title;
    item_list.push_back(item);
  }

  if (!drop_data.html.is_null()) {
    WebDragData::Item item;
    item.storageType = WebDragData::Item::StorageTypeString;
    item.stringType = WebString::fromUTF8(ui::Clipboard::kMimeTypeHTML);
    item.stringData = drop_data.html.string();
    item.baseURL = drop_data.html_base_url;
    item_list.push_back(item);
  }

  for (std::vector<DropData::FileInfo>::const_iterator it =
           drop_data.filenames.begin();
       it != drop_data.filenames.end();
       ++it) {
    WebDragData::Item item;
    item.storageType = WebDragData::Item::StorageTypeFilename;
    item.filenameData = it->path;
    item.displayNameData = it->display_name;
    item_list.push_back(item);
  }

  for (std::map<base::string16, base::string16>::const_iterator it =
           drop_data.custom_data.begin();
       it != drop_data.custom_data.end();
       ++it) {
    WebDragData::Item item;
    item.storageType = WebDragData::Item::StorageTypeString;
    item.stringType = it->first;
    item.stringData = it->second;
    item_list.push_back(item);
  }

  WebDragData result;
  result.initialize();
  result.setItems(item_list);
  result.setFilesystemId(drop_data.filesystem_id);
  return result;
}

}  // namespace

RenderViewImpl::RenderViewImpl(RenderViewImplParams* params)
    : RenderWidget(blink::WebPopupTypeNone,
                   params->screen_info,
                   params->swapped_out,
                   params->hidden),
      webkit_preferences_(params->webkit_prefs),
      send_content_state_immediately_(false),
      enabled_bindings_(0),
      send_preferred_size_changes_(false),
      is_loading_(false),
      navigation_gesture_(NavigationGestureUnknown),
      opened_by_user_gesture_(true),
      opener_suppressed_(false),
      suppress_dialogs_until_swap_out_(false),
      page_id_(-1),
      last_page_id_sent_to_browser_(-1),
      next_page_id_(params->next_page_id),
      history_list_offset_(-1),
      history_list_length_(0),
      target_url_status_(TARGET_NONE),
      selection_text_offset_(0),
      selection_range_(gfx::Range::InvalidRange()),
#if defined(OS_ANDROID)
      top_controls_constraints_(cc::BOTH),
#endif
      cached_is_main_frame_pinned_to_left_(false),
      cached_is_main_frame_pinned_to_right_(false),
      cached_has_main_frame_horizontal_scrollbar_(false),
      cached_has_main_frame_vertical_scrollbar_(false),
      cookie_jar_(this),
      notification_provider_(NULL),
      geolocation_dispatcher_(NULL),
      input_tag_speech_dispatcher_(NULL),
      speech_recognition_dispatcher_(NULL),
      media_stream_dispatcher_(NULL),
      browser_plugin_manager_(NULL),
      media_stream_client_(NULL),
      web_user_media_client_(NULL),
      midi_dispatcher_(NULL),
      devtools_agent_(NULL),
      accessibility_mode_(AccessibilityModeOff),
      renderer_accessibility_(NULL),
      mouse_lock_dispatcher_(NULL),
#if defined(OS_ANDROID)
      body_background_color_(SK_ColorWHITE),
      expected_content_intent_id_(0),
      media_player_manager_(NULL),
#endif
#if defined(OS_WIN)
      focused_plugin_id_(-1),
#endif
#if defined(ENABLE_PLUGINS)
      focused_pepper_plugin_(NULL),
      pepper_last_mouse_event_target_(NULL),
#endif
      enumeration_completion_id_(0),
      load_progress_tracker_(new LoadProgressTracker(this)),
      session_storage_namespace_id_(params->session_storage_namespace_id),
      handling_select_range_(false),
      next_snapshot_id_(0),
      allow_partial_swap_(params->allow_partial_swap),
      context_menu_source_type_(ui::MENU_SOURCE_MOUSE) {
}

void RenderViewImpl::Initialize(RenderViewImplParams* params) {
  routing_id_ = params->routing_id;
  surface_id_ = params->surface_id;
  if (params->opener_id != MSG_ROUTING_NONE && params->is_renderer_created)
    opener_id_ = params->opener_id;

  // Ensure we start with a valid next_page_id_ from the browser.
  DCHECK_GE(next_page_id_, 0);

#if defined(ENABLE_NOTIFICATIONS)
  notification_provider_ = new NotificationProvider(this);
#else
  notification_provider_ = NULL;
#endif

  webwidget_ = WebView::create(this);
  webwidget_mouse_lock_target_.reset(new WebWidgetLockTarget(webwidget_));

  const CommandLine& command_line = *CommandLine::ForCurrentProcess();

  if (command_line.HasSwitch(switches::kStatsCollectionController))
    stats_collection_observer_.reset(new StatsCollectionObserver(this));

#if defined(OS_ANDROID)
  content::DeviceTelephonyInfo device_info;

  const std::string region_code =
      command_line.HasSwitch(switches::kNetworkCountryIso)
          ? command_line.GetSwitchValueASCII(switches::kNetworkCountryIso)
          : device_info.GetNetworkCountryIso();
  content_detectors_.push_back(linked_ptr<ContentDetector>(
      new AddressDetector()));
  content_detectors_.push_back(linked_ptr<ContentDetector>(
      new PhoneNumberDetector(region_code)));
  content_detectors_.push_back(linked_ptr<ContentDetector>(
      new EmailDetector()));
#endif

  RenderThread::Get()->AddRoute(routing_id_, this);
  // Take a reference on behalf of the RenderThread.  This will be balanced
  // when we receive ViewMsg_ClosePage.
  AddRef();
  if (is_hidden_)
    RenderThread::Get()->WidgetHidden();

  // If this is a popup, we must wait for the CreatingNew_ACK message before
  // completing initialization.  Otherwise, we can finish it now.
  if (opener_id_ == MSG_ROUTING_NONE) {
    did_show_ = true;
    CompleteInit();
  }

  g_view_map.Get().insert(std::make_pair(webview(), this));
  g_routing_id_view_map.Get().insert(std::make_pair(routing_id_, this));
  webview()->setDeviceScaleFactor(device_scale_factor_);
  webview()->settings()->setAcceleratedCompositingForFixedPositionEnabled(
      ShouldUseFixedPositionCompositing(device_scale_factor_));
  webview()->settings()->setAcceleratedCompositingForOverflowScrollEnabled(
      ShouldUseAcceleratedCompositingForOverflowScroll(device_scale_factor_));
  webview()->settings()->setCompositorDrivenAcceleratedScrollingEnabled(
      ShouldUseUniversalAcceleratedCompositingForOverflowScroll());
  webview()->settings()->setAcceleratedCompositingForTransitionEnabled(
      ShouldUseTransitionCompositing(device_scale_factor_));
  webview()->settings()->setAcceleratedCompositingForFixedRootBackgroundEnabled(
      ShouldUseAcceleratedFixedRootBackground(device_scale_factor_));
  webview()->settings()->setAcceleratedCompositingForScrollableFramesEnabled(
      ShouldUseAcceleratedCompositingForScrollableFrames(device_scale_factor_));
  webview()->settings()->setCompositedScrollingForFramesEnabled(
      ShouldUseCompositedScrollingForFrames(device_scale_factor_));

  ApplyWebPreferences(webkit_preferences_, webview());

  main_render_frame_.reset(
      RenderFrameImpl::Create(this, params->main_frame_routing_id));
  // The main frame WebFrame object is closed by
  // RenderViewImpl::frameDetached().
  webview()->setMainFrame(WebFrame::create(main_render_frame_.get()));

  if (switches::IsTouchDragDropEnabled())
    webview()->settings()->setTouchDragDropEnabled(true);

  if (switches::IsTouchEditingEnabled())
    webview()->settings()->setTouchEditingEnabled(true);

  if (!params->frame_name.empty())
    webview()->mainFrame()->setName(params->frame_name);

  OnSetRendererPrefs(params->renderer_prefs);

#if defined(ENABLE_WEBRTC)
  if (!media_stream_dispatcher_)
    media_stream_dispatcher_ = new MediaStreamDispatcher(this);
#endif

  new MHTMLGenerator(this);
#if defined(OS_MACOSX)
  new TextInputClientObserver(this);
#endif  // defined(OS_MACOSX)

  new SharedWorkerRepository(this);

#if defined(OS_ANDROID)
  media_player_manager_ = new RendererMediaPlayerManager(this);
  new JavaBridgeDispatcher(this);
#endif

  // The next group of objects all implement RenderViewObserver, so are deleted
  // along with the RenderView automatically.
  devtools_agent_ = new DevToolsAgent(this);
  if (RenderWidgetCompositor* rwc = compositor()) {
    webview()->devToolsAgent()->setLayerTreeId(rwc->GetLayerTreeId());
  }
  mouse_lock_dispatcher_ = new RenderViewMouseLockDispatcher(this);
  new ImageLoadingHelper(this);

  // Create renderer_accessibility_ if needed.
  OnSetAccessibilityMode(params->accessibility_mode);

  new IdleUserDetector(this);

  if (command_line.HasSwitch(switches::kDomAutomationController))
    enabled_bindings_ |= BINDINGS_POLICY_DOM_AUTOMATION;
  if (command_line.HasSwitch(switches::kStatsCollectionController))
    enabled_bindings_ |= BINDINGS_POLICY_STATS_COLLECTION;

  ProcessViewLayoutFlags(command_line);

  GetContentClient()->renderer()->RenderViewCreated(this);

  // If we have an opener_id but we weren't created by a renderer, then
  // it's the browser asking us to set our opener to another RenderView.
  if (params->opener_id != MSG_ROUTING_NONE && !params->is_renderer_created) {
    RenderViewImpl* opener_view = FromRoutingID(params->opener_id);
    if (opener_view)
      webview()->mainFrame()->setOpener(opener_view->webview()->mainFrame());
  }

  // If we are initially swapped out, navigate to kSwappedOutURL.
  // This ensures we are in a unique origin that others cannot script.
  if (is_swapped_out_)
    NavigateToSwappedOutURL(webview()->mainFrame());
}

RenderViewImpl::~RenderViewImpl() {
  history_page_ids_.clear();

  base::debug::TraceLog::GetInstance()->RemoveProcessLabel(routing_id_);

  // If file chooser is still waiting for answer, dispatch empty answer.
  while (!file_chooser_completions_.empty()) {
    if (file_chooser_completions_.front()->completion) {
      file_chooser_completions_.front()->completion->didChooseFile(
          WebVector<WebString>());
    }
    file_chooser_completions_.pop_front();
  }

#if defined(OS_ANDROID)
  // The date/time picker client is both a scoped_ptr member of this class and
  // a RenderViewObserver. Reset it to prevent double deletion.
  date_time_picker_client_.reset();
#endif

#ifndef NDEBUG
  // Make sure we are no longer referenced by the ViewMap or RoutingIDViewMap.
  ViewMap* views = g_view_map.Pointer();
  for (ViewMap::iterator it = views->begin(); it != views->end(); ++it)
    DCHECK_NE(this, it->second) << "Failed to call Close?";
  RoutingIDViewMap* routing_id_views = g_routing_id_view_map.Pointer();
  for (RoutingIDViewMap::iterator it = routing_id_views->begin();
       it != routing_id_views->end(); ++it)
    DCHECK_NE(this, it->second) << "Failed to call Close?";
#endif

  FOR_EACH_OBSERVER(RenderViewObserver, observers_, RenderViewGone());
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, OnDestruct());
}

/*static*/
RenderViewImpl* RenderViewImpl::FromWebView(WebView* webview) {
  ViewMap* views = g_view_map.Pointer();
  ViewMap::iterator it = views->find(webview);
  return it == views->end() ? NULL : it->second;
}

/*static*/
RenderView* RenderView::FromWebView(blink::WebView* webview) {
  return RenderViewImpl::FromWebView(webview);
}

/*static*/
RenderViewImpl* RenderViewImpl::FromRoutingID(int32 routing_id) {
  RoutingIDViewMap* views = g_routing_id_view_map.Pointer();
  RoutingIDViewMap::iterator it = views->find(routing_id);
  return it == views->end() ? NULL : it->second;
}

/*static*/
RenderView* RenderView::FromRoutingID(int routing_id) {
  return RenderViewImpl::FromRoutingID(routing_id);
}

/*static*/
void RenderView::ForEach(RenderViewVisitor* visitor) {
  ViewMap* views = g_view_map.Pointer();
  for (ViewMap::iterator it = views->begin(); it != views->end(); ++it) {
    if (!visitor->Visit(it->second))
      return;
  }
}

/*static*/
RenderViewImpl* RenderViewImpl::Create(
    int32 opener_id,
    const RendererPreferences& renderer_prefs,
    const WebPreferences& webkit_prefs,
    int32 routing_id,
    int32 main_frame_routing_id,
    int32 surface_id,
    int64 session_storage_namespace_id,
    const base::string16& frame_name,
    bool is_renderer_created,
    bool swapped_out,
    bool hidden,
    int32 next_page_id,
    const blink::WebScreenInfo& screen_info,
    AccessibilityMode accessibility_mode,
    bool allow_partial_swap) {
  DCHECK(routing_id != MSG_ROUTING_NONE);
  RenderViewImplParams params(
      opener_id,
      renderer_prefs,
      webkit_prefs,
      routing_id,
      main_frame_routing_id,
      surface_id,
      session_storage_namespace_id,
      frame_name,
      is_renderer_created,
      swapped_out,
      hidden,
      next_page_id,
      screen_info,
      accessibility_mode,
      allow_partial_swap);
  RenderViewImpl* render_view = NULL;
  if (g_create_render_view_impl)
    render_view = g_create_render_view_impl(&params);
  else
    render_view = new RenderViewImpl(&params);
  render_view->Initialize(&params);
  return render_view;
}

// static
void RenderViewImpl::InstallCreateHook(
    RenderViewImpl* (*create_render_view_impl)(RenderViewImplParams*)) {
  CHECK(!g_create_render_view_impl);
  g_create_render_view_impl = create_render_view_impl;
}

void RenderViewImpl::AddObserver(RenderViewObserver* observer) {
  observers_.AddObserver(observer);
}

void RenderViewImpl::RemoveObserver(RenderViewObserver* observer) {
  observer->RenderViewGone();
  observers_.RemoveObserver(observer);
}

blink::WebView* RenderViewImpl::webview() const {
  return static_cast<blink::WebView*>(webwidget());
}

#if defined(ENABLE_PLUGINS)
void RenderViewImpl::RegisterPluginDelegate(WebPluginDelegateProxy* delegate) {
  plugin_delegates_.insert(delegate);
  // If the renderer is visible, set initial visibility and focus state.
  if (!is_hidden()) {
#if defined(OS_MACOSX)
    delegate->SetContainerVisibility(true);
    if (webview() && webview()->isActive())
      delegate->SetWindowFocus(true);
#endif
  }
  // Plugins start assuming the content has focus (so that they work in
  // environments where RenderView isn't hosting them), so we always have to
  // set the initial state. See webplugin_delegate_impl.h for details.
  delegate->SetContentAreaFocus(has_focus());
}

void RenderViewImpl::UnregisterPluginDelegate(
    WebPluginDelegateProxy* delegate) {
  plugin_delegates_.erase(delegate);
}

#if defined(OS_WIN)
void RenderViewImpl::PluginFocusChanged(bool focused, int plugin_id) {
  if (focused)
    focused_plugin_id_ = plugin_id;
  else
    focused_plugin_id_ = -1;
}
#endif

#if defined(OS_MACOSX)
void RenderViewImpl::PluginFocusChanged(bool focused, int plugin_id) {
  Send(new ViewHostMsg_PluginFocusChanged(routing_id(), focused, plugin_id));
}

void RenderViewImpl::StartPluginIme() {
  IPC::Message* msg = new ViewHostMsg_StartPluginIme(routing_id());
  // This message can be sent during event-handling, and needs to be delivered
  // within that context.
  msg->set_unblock(true);
  Send(msg);
}
#endif  // defined(OS_MACOSX)

#endif  // ENABLE_PLUGINS

void RenderViewImpl::TransferActiveWheelFlingAnimation(
    const blink::WebActiveWheelFlingParameters& params) {
  if (webview())
    webview()->transferActiveWheelFlingAnimation(params);
}

bool RenderViewImpl::HasIMETextFocus() {
  return GetTextInputType() != ui::TEXT_INPUT_TYPE_NONE;
}

bool RenderViewImpl::OnMessageReceived(const IPC::Message& message) {
  WebFrame* main_frame = webview() ? webview()->mainFrame() : NULL;
  if (main_frame)
    GetContentClient()->SetActiveURL(main_frame->document().url());

  ObserverListBase<RenderViewObserver>::Iterator it(observers_);
  RenderViewObserver* observer;
  while ((observer = it.GetNext()) != NULL)
    if (observer->OnMessageReceived(message))
      return true;

  bool handled = true;
  bool msg_is_ok = true;
  IPC_BEGIN_MESSAGE_MAP_EX(RenderViewImpl, message, msg_is_ok)
    IPC_MESSAGE_HANDLER(InputMsg_Copy, OnCopy)
    IPC_MESSAGE_HANDLER(InputMsg_Cut, OnCut)
    IPC_MESSAGE_HANDLER(InputMsg_Delete, OnDelete)
    IPC_MESSAGE_HANDLER(InputMsg_ExecuteEditCommand, OnExecuteEditCommand)
    IPC_MESSAGE_HANDLER(InputMsg_MoveCaret, OnMoveCaret)
    IPC_MESSAGE_HANDLER(InputMsg_Paste, OnPaste)
    IPC_MESSAGE_HANDLER(InputMsg_PasteAndMatchStyle, OnPasteAndMatchStyle)
    IPC_MESSAGE_HANDLER(InputMsg_Redo, OnRedo)
    IPC_MESSAGE_HANDLER(InputMsg_Replace, OnReplace)
    IPC_MESSAGE_HANDLER(InputMsg_ReplaceMisspelling, OnReplaceMisspelling)
    IPC_MESSAGE_HANDLER(InputMsg_ScrollFocusedEditableNodeIntoRect,
                        OnScrollFocusedEditableNodeIntoRect)
    IPC_MESSAGE_HANDLER(InputMsg_SelectAll, OnSelectAll)
    IPC_MESSAGE_HANDLER(InputMsg_SelectRange, OnSelectRange)
    IPC_MESSAGE_HANDLER(InputMsg_SetEditCommandsForNextKeyEvent,
                        OnSetEditCommandsForNextKeyEvent)
    IPC_MESSAGE_HANDLER(InputMsg_Undo, OnUndo)
    IPC_MESSAGE_HANDLER(InputMsg_Unselect, OnUnselect)
    IPC_MESSAGE_HANDLER(ViewMsg_Navigate, OnNavigate)
    IPC_MESSAGE_HANDLER(ViewMsg_Stop, OnStop)
    IPC_MESSAGE_HANDLER(ViewMsg_ReloadFrame, OnReloadFrame)
    IPC_MESSAGE_HANDLER(ViewMsg_SetName, OnSetName)
    IPC_MESSAGE_HANDLER(ViewMsg_SetEditableSelectionOffsets,
                        OnSetEditableSelectionOffsets)
    IPC_MESSAGE_HANDLER(ViewMsg_SetCompositionFromExistingText,
                        OnSetCompositionFromExistingText)
    IPC_MESSAGE_HANDLER(ViewMsg_ExtendSelectionAndDelete,
                        OnExtendSelectionAndDelete)
    IPC_MESSAGE_HANDLER(ViewMsg_CopyImageAt, OnCopyImageAt)
    IPC_MESSAGE_HANDLER(ViewMsg_Find, OnFind)
    IPC_MESSAGE_HANDLER(ViewMsg_StopFinding, OnStopFinding)
    IPC_MESSAGE_HANDLER(ViewMsg_Zoom, OnZoom)
    IPC_MESSAGE_HANDLER(ViewMsg_SetZoomLevel, OnSetZoomLevel)
    IPC_MESSAGE_HANDLER(ViewMsg_ZoomFactor, OnZoomFactor)
    IPC_MESSAGE_HANDLER(ViewMsg_SetZoomLevelForLoadingURL,
                        OnSetZoomLevelForLoadingURL)
    IPC_MESSAGE_HANDLER(ViewMsg_SetPageEncoding, OnSetPageEncoding)
    IPC_MESSAGE_HANDLER(ViewMsg_ResetPageEncodingToDefault,
                        OnResetPageEncodingToDefault)
    IPC_MESSAGE_HANDLER(ViewMsg_ScriptEvalRequest, OnScriptEvalRequest)
    IPC_MESSAGE_HANDLER(ViewMsg_PostMessageEvent, OnPostMessageEvent)
    IPC_MESSAGE_HANDLER(ViewMsg_CSSInsertRequest, OnCSSInsertRequest)
    IPC_MESSAGE_HANDLER(DragMsg_TargetDragEnter, OnDragTargetDragEnter)
    IPC_MESSAGE_HANDLER(DragMsg_TargetDragOver, OnDragTargetDragOver)
    IPC_MESSAGE_HANDLER(DragMsg_TargetDragLeave, OnDragTargetDragLeave)
    IPC_MESSAGE_HANDLER(DragMsg_TargetDrop, OnDragTargetDrop)
    IPC_MESSAGE_HANDLER(DragMsg_SourceEndedOrMoved, OnDragSourceEndedOrMoved)
    IPC_MESSAGE_HANDLER(DragMsg_SourceSystemDragEnded,
                        OnDragSourceSystemDragEnded)
    IPC_MESSAGE_HANDLER(ViewMsg_AllowBindings, OnAllowBindings)
    IPC_MESSAGE_HANDLER(ViewMsg_SetInitialFocus, OnSetInitialFocus)
    IPC_MESSAGE_HANDLER(ViewMsg_UpdateTargetURL_ACK, OnUpdateTargetURLAck)
    IPC_MESSAGE_HANDLER(ViewMsg_UpdateWebPreferences, OnUpdateWebPreferences)
    IPC_MESSAGE_HANDLER(ViewMsg_TimezoneChange, OnUpdateTimezone)
    IPC_MESSAGE_HANDLER(ViewMsg_SetAltErrorPageURL, OnSetAltErrorPageURL)
    IPC_MESSAGE_HANDLER(ViewMsg_EnumerateDirectoryResponse,
                        OnEnumerateDirectoryResponse)
    IPC_MESSAGE_HANDLER(ViewMsg_RunFileChooserResponse, OnFileChooserResponse)
    IPC_MESSAGE_HANDLER(ViewMsg_ShouldClose, OnShouldClose)
    IPC_MESSAGE_HANDLER(ViewMsg_SuppressDialogsUntilSwapOut,
                        OnSuppressDialogsUntilSwapOut)
    IPC_MESSAGE_HANDLER(ViewMsg_SwapOut, OnSwapOut)
    IPC_MESSAGE_HANDLER(ViewMsg_ClosePage, OnClosePage)
    IPC_MESSAGE_HANDLER(ViewMsg_ThemeChanged, OnThemeChanged)
    IPC_MESSAGE_HANDLER(ViewMsg_MoveOrResizeStarted, OnMoveOrResizeStarted)
    IPC_MESSAGE_HANDLER(ViewMsg_ClearFocusedNode, OnClearFocusedNode)
    IPC_MESSAGE_HANDLER(ViewMsg_SetBackground, OnSetBackground)
    IPC_MESSAGE_HANDLER(ViewMsg_EnablePreferredSizeChangedMode,
                        OnEnablePreferredSizeChangedMode)
    IPC_MESSAGE_HANDLER(ViewMsg_EnableAutoResize, OnEnableAutoResize)
    IPC_MESSAGE_HANDLER(ViewMsg_DisableAutoResize, OnDisableAutoResize)
    IPC_MESSAGE_HANDLER(ViewMsg_DisableScrollbarsForSmallWindows,
                        OnDisableScrollbarsForSmallWindows)
    IPC_MESSAGE_HANDLER(ViewMsg_SetRendererPrefs, OnSetRendererPrefs)
    IPC_MESSAGE_HANDLER(ViewMsg_MediaPlayerActionAt, OnMediaPlayerActionAt)
    IPC_MESSAGE_HANDLER(ViewMsg_OrientationChangeEvent,
                        OnOrientationChangeEvent)
    IPC_MESSAGE_HANDLER(ViewMsg_PluginActionAt, OnPluginActionAt)
    IPC_MESSAGE_HANDLER(ViewMsg_SetActive, OnSetActive)
    IPC_MESSAGE_HANDLER(ViewMsg_CustomContextMenuAction,
                        OnCustomContextMenuAction)
    IPC_MESSAGE_HANDLER(ViewMsg_GetAllSavableResourceLinksForCurrentPage,
                        OnGetAllSavableResourceLinksForCurrentPage)
    IPC_MESSAGE_HANDLER(
        ViewMsg_GetSerializedHtmlDataForCurrentPageWithLocalLinks,
        OnGetSerializedHtmlDataForCurrentPageWithLocalLinks)
    IPC_MESSAGE_HANDLER(ViewMsg_ContextMenuClosed, OnContextMenuClosed)
    IPC_MESSAGE_HANDLER(ViewMsg_ShowContextMenu, OnShowContextMenu)
    // TODO(viettrungluu): Move to a separate message filter.
    IPC_MESSAGE_HANDLER(ViewMsg_SetHistoryLengthAndPrune,
                        OnSetHistoryLengthAndPrune)
    IPC_MESSAGE_HANDLER(ViewMsg_EnableViewSourceMode, OnEnableViewSourceMode)
    IPC_MESSAGE_HANDLER(ViewMsg_SetAccessibilityMode, OnSetAccessibilityMode)
    IPC_MESSAGE_HANDLER(ViewMsg_DisownOpener, OnDisownOpener)
    IPC_MESSAGE_HANDLER(ViewMsg_ReleaseDisambiguationPopupDIB,
                        OnReleaseDisambiguationPopupDIB)
    IPC_MESSAGE_HANDLER(ViewMsg_WindowSnapshotCompleted,
                        OnWindowSnapshotCompleted)
#if defined(OS_ANDROID)
    IPC_MESSAGE_HANDLER(InputMsg_ActivateNearestFindResult,
                        OnActivateNearestFindResult)
    IPC_MESSAGE_HANDLER(ViewMsg_FindMatchRects, OnFindMatchRects)
    IPC_MESSAGE_HANDLER(ViewMsg_SelectPopupMenuItems, OnSelectPopupMenuItems)
    IPC_MESSAGE_HANDLER(ViewMsg_UndoScrollFocusedEditableNodeIntoView,
                        OnUndoScrollFocusedEditableNodeIntoRect)
    IPC_MESSAGE_HANDLER(ViewMsg_UpdateTopControlsState,
                        OnUpdateTopControlsState)
    IPC_MESSAGE_HANDLER(ViewMsg_PauseVideo, OnPauseVideo)
    IPC_MESSAGE_HANDLER(ViewMsg_ExtractSmartClipData, OnExtractSmartClipData)
#elif defined(OS_MACOSX)
    IPC_MESSAGE_HANDLER(InputMsg_CopyToFindPboard, OnCopyToFindPboard)
    IPC_MESSAGE_HANDLER(ViewMsg_PluginImeCompositionCompleted,
                        OnPluginImeCompositionCompleted)
    IPC_MESSAGE_HANDLER(ViewMsg_SelectPopupMenuItem, OnSelectPopupMenuItem)
    IPC_MESSAGE_HANDLER(ViewMsg_SetInLiveResize, OnSetInLiveResize)
    IPC_MESSAGE_HANDLER(ViewMsg_SetWindowVisibility, OnSetWindowVisibility)
    IPC_MESSAGE_HANDLER(ViewMsg_WindowFrameChanged, OnWindowFrameChanged)
#endif
    // Adding a new message? Add platform independent ones first, then put the
    // platform specific ones at the end.

    // Have the super handle all other messages.
    IPC_MESSAGE_UNHANDLED(handled = RenderWidget::OnMessageReceived(message))
  IPC_END_MESSAGE_MAP()

  if (!msg_is_ok) {
    // The message had a handler, but its deserialization failed.
    // Kill the renderer to avoid potential spoofing attacks.
    CHECK(false) << "Unable to deserialize message in RenderViewImpl.";
  }

  return handled;
}

void RenderViewImpl::OnNavigate(const ViewMsg_Navigate_Params& params) {
  MaybeHandleDebugURL(params.url);
  if (!webview())
    return;

  FOR_EACH_OBSERVER(RenderViewObserver, observers_, Navigate(params.url));

  bool is_reload = IsReload(params);

  // If this is a stale back/forward (due to a recent navigation the browser
  // didn't know about), ignore it.
  if (IsBackForwardToStaleEntry(params, is_reload))
    return;

  // Swap this renderer back in if necessary.
  if (is_swapped_out_) {
    // We marked the view as hidden when swapping the view out, so be sure to
    // reset the visibility state before navigating to the new URL.
    webview()->setVisibilityState(visibilityState(), false);

    // If this is an attempt to reload while we are swapped out, we should not
    // reload swappedout://, but the previous page, which is stored in
    // params.state.  Setting is_reload to false will treat this like a back
    // navigation to accomplish that.
    is_reload = false;

    // We refresh timezone when a view is swapped in since timezone
    // can get out of sync when the system timezone is updated while
    // the view is swapped out.
    NotifyTimezoneChange(webview()->mainFrame());

    SetSwappedOut(false);
  }

  if (params.should_clear_history_list) {
    CHECK_EQ(params.pending_history_list_offset, -1);
    CHECK_EQ(params.current_history_list_offset, -1);
    CHECK_EQ(params.current_history_list_length, 0);
  }
  history_list_offset_ = params.current_history_list_offset;
  history_list_length_ = params.current_history_list_length;
  if (history_list_length_ >= 0)
    history_page_ids_.resize(history_list_length_, -1);
  if (params.pending_history_list_offset >= 0 &&
      params.pending_history_list_offset < history_list_length_)
    history_page_ids_[params.pending_history_list_offset] = params.page_id;

  GetContentClient()->SetActiveURL(params.url);

  WebFrame* frame = webview()->mainFrame();
  if (!params.frame_to_navigate.empty()) {
    frame = webview()->findFrameByName(
        WebString::fromUTF8(params.frame_to_navigate));
    CHECK(frame) << "Invalid frame name passed: " << params.frame_to_navigate;
  }

  if (is_reload && frame->currentHistoryItem().isNull()) {
    // We cannot reload if we do not have any history state.  This happens, for
    // example, when recovering from a crash.  Our workaround here is a bit of
    // a hack since it means that reload after a crashed tab does not cause an
    // end-to-end cache validation.
    is_reload = false;
  }

  pending_navigation_params_.reset(new ViewMsg_Navigate_Params(params));

  // If we are reloading, then WebKit will use the history state of the current
  // page, so we should just ignore any given history state.  Otherwise, if we
  // have history state, then we need to navigate to it, which corresponds to a
  // back/forward navigation event.
  if (is_reload) {
    bool reload_original_url =
        (params.navigation_type ==
            ViewMsg_Navigate_Type::RELOAD_ORIGINAL_REQUEST_URL);
    bool ignore_cache = (params.navigation_type ==
                             ViewMsg_Navigate_Type::RELOAD_IGNORING_CACHE);

    if (reload_original_url)
      frame->reloadWithOverrideURL(params.url, true);
    else
      frame->reload(ignore_cache);
  } else if (params.page_state.IsValid()) {
    // We must know the page ID of the page we are navigating back to.
    DCHECK_NE(params.page_id, -1);
    WebHistoryItem item = PageStateToHistoryItem(params.page_state);
    if (!item.isNull()) {
      // Ensure we didn't save the swapped out URL in UpdateState, since the
      // browser should never be telling us to navigate to swappedout://.
      CHECK(item.urlString() != WebString::fromUTF8(kSwappedOutURL));
      frame->loadHistoryItem(item);
    }
  } else if (!params.base_url_for_data_url.is_empty()) {
    // A loadData request with a specified base URL.
    std::string mime_type, charset, data;
    if (net::DataURL::Parse(params.url, &mime_type, &charset, &data)) {
      frame->loadData(
          WebData(data.c_str(), data.length()),
          WebString::fromUTF8(mime_type),
          WebString::fromUTF8(charset),
          params.base_url_for_data_url,
          params.history_url_for_data_url,
          false);
    } else {
      CHECK(false) <<
          "Invalid URL passed: " << params.url.possibly_invalid_spec();
    }
  } else {
    // Navigate to the given URL.
    WebURLRequest request(params.url);

    // A session history navigation should have been accompanied by state.
    CHECK_EQ(params.page_id, -1);

    if (frame->isViewSourceModeEnabled())
      request.setCachePolicy(WebURLRequest::ReturnCacheDataElseLoad);

    if (params.referrer.url.is_valid()) {
      WebString referrer = WebSecurityPolicy::generateReferrerHeader(
          params.referrer.policy,
          params.url,
          WebString::fromUTF8(params.referrer.url.spec()));
      if (!referrer.isEmpty())
        request.setHTTPHeaderField(WebString::fromUTF8("Referer"), referrer);
    }

    if (!params.extra_headers.empty()) {
      for (net::HttpUtil::HeadersIterator i(params.extra_headers.begin(),
                                            params.extra_headers.end(), "\n");
           i.GetNext(); ) {
        request.addHTTPHeaderField(WebString::fromUTF8(i.name()),
                                   WebString::fromUTF8(i.values()));
      }
    }

    if (params.is_post) {
      request.setHTTPMethod(WebString::fromUTF8("POST"));

      // Set post data.
      WebHTTPBody http_body;
      http_body.initialize();
      const char* data = NULL;
      if (params.browser_initiated_post_data.size()) {
        data = reinterpret_cast<const char*>(
            &params.browser_initiated_post_data.front());
      }
      http_body.appendData(
          WebData(data, params.browser_initiated_post_data.size()));
      request.setHTTPBody(http_body);
    }

    frame->loadRequest(request);

    // If this is a cross-process navigation, the browser process will send
    // along the proper navigation start value.
    if (!params.browser_navigation_start.is_null() &&
        frame->provisionalDataSource()) {
      // browser_navigation_start is likely before this process existed, so we
      // can't use InterProcessTimeTicksConverter. Instead, the best we can do
      // is just ensure we don't report a bogus value in the future.
      base::TimeTicks navigation_start = std::min(
          base::TimeTicks::Now(), params.browser_navigation_start);
      double navigation_start_seconds =
          (navigation_start - base::TimeTicks()).InSecondsF();
      frame->provisionalDataSource()->setNavigationStartTime(
          navigation_start_seconds);
    }
  }

  // In case LoadRequest failed before DidCreateDataSource was called.
  pending_navigation_params_.reset();
}

bool RenderViewImpl::IsBackForwardToStaleEntry(
    const ViewMsg_Navigate_Params& params,
    bool is_reload) {
  // Make sure this isn't a back/forward to an entry we have already cropped
  // or replaced from our history, before the browser knew about it.  If so,
  // a new navigation has committed in the mean time, and we can ignore this.
  bool is_back_forward = !is_reload && params.page_state.IsValid();

  // Note: if the history_list_length_ is 0 for a back/forward, we must be
  // restoring from a previous session.  We'll update our state in OnNavigate.
  if (!is_back_forward || history_list_length_ <= 0)
    return false;

  DCHECK_EQ(static_cast<int>(history_page_ids_.size()), history_list_length_);

  // Check for whether the forward history has been cropped due to a recent
  // navigation the browser didn't know about.
  if (params.pending_history_list_offset >= history_list_length_)
    return true;

  // Check for whether this entry has been replaced with a new one.
  int expected_page_id =
      history_page_ids_[params.pending_history_list_offset];
  if (expected_page_id > 0 && params.page_id != expected_page_id) {
    if (params.page_id < expected_page_id)
      return true;

    // Otherwise we've removed an earlier entry and should have shifted all
    // entries left.  For now, it's ok to lazily update the list.
    // TODO(creis): Notify all live renderers when we remove entries from
    // the front of the list, so that we don't hit this case.
    history_page_ids_[params.pending_history_list_offset] = params.page_id;
  }

  return false;
}

// Stop loading the current page
void RenderViewImpl::OnStop() {
  if (webview()) {
    WebFrame* main_frame = webview()->mainFrame();
    // Stop the alt error page fetcher. If we let it continue it may complete
    // and cause RenderFrameHostManager to swap to this RenderView, even though
    // it may no longer be active.
    StopAltErrorPageFetcher(main_frame->provisionalDataSource());
    StopAltErrorPageFetcher(main_frame->dataSource());
    main_frame->stopLoading();
  }
}

// Reload current focused frame.
// E.g. called by right-clicking on the frame and picking "reload this frame".
void RenderViewImpl::OnReloadFrame() {
  if (webview() && webview()->focusedFrame()) {
    // We always obey the cache (ignore_cache=false) here.
    // TODO(evanm): perhaps we could allow shift-clicking the menu item to do
    // a cache-ignoring reload of the frame.
    webview()->focusedFrame()->reload(false);
  }
}

void RenderViewImpl::OnCopyImageAt(int x, int y) {
  webview()->copyImageAt(WebPoint(x, y));
}

void RenderViewImpl::OnUpdateTargetURLAck() {
  // Check if there is a targeturl waiting to be sent.
  if (target_url_status_ == TARGET_PENDING) {
    Send(new ViewHostMsg_UpdateTargetURL(routing_id_, page_id_,
                                         pending_target_url_));
  }

  target_url_status_ = TARGET_NONE;
}

void RenderViewImpl::OnCopy() {
  if (!webview())
    return;

  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  WebNode current_node = context_menu_node_.isNull() ?
      GetFocusedNode() : context_menu_node_;
  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Copy"),
                                            current_node);
}

void RenderViewImpl::OnCut() {
  if (!webview())
    return;

  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Cut"),
                                            GetFocusedNode());
}

void RenderViewImpl::OnDelete() {
  if (!webview())
    return;

  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Delete"),
                                            GetFocusedNode());
}

void RenderViewImpl::OnExecuteEditCommand(const std::string& name,
    const std::string& value) {
  if (!webview() || !webview()->focusedFrame())
    return;

  webview()->focusedFrame()->executeCommand(
      WebString::fromUTF8(name), WebString::fromUTF8(value));
}

void RenderViewImpl::OnMoveCaret(const gfx::Point& point) {
  if (!webview())
    return;

  Send(new ViewHostMsg_MoveCaret_ACK(routing_id_));

  webview()->focusedFrame()->moveCaretSelection(point);
}

void RenderViewImpl::OnPaste() {
  if (!webview())
    return;

  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Paste"),
                                            GetFocusedNode());
}

void RenderViewImpl::OnPasteAndMatchStyle() {
  if (!webview())
    return;

  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  webview()->focusedFrame()->executeCommand(
      WebString::fromUTF8("PasteAndMatchStyle"), GetFocusedNode());
}

void RenderViewImpl::OnRedo() {
  if (!webview())
    return;

  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Redo"),
                                            GetFocusedNode());
}

void RenderViewImpl::OnReplace(const base::string16& text) {
  if (!webview())
    return;

  WebFrame* frame = webview()->focusedFrame();
  if (!frame->hasSelection())
    frame->selectWordAroundCaret();

  frame->replaceSelection(text);
}

void RenderViewImpl::OnReplaceMisspelling(const base::string16& text) {
  if (!webview())
    return;

  WebFrame* frame = webview()->focusedFrame();
  if (!frame->hasSelection())
    return;

  frame->replaceMisspelledRange(text);
}

void RenderViewImpl::OnScrollFocusedEditableNodeIntoRect(
    const gfx::Rect& rect) {
  blink::WebNode node = GetFocusedNode();
  if (!node.isNull()) {
    if (IsEditableNode(node)) {
      webview()->saveScrollAndScaleState();
      webview()->scrollFocusedNodeIntoRect(rect);
    }
  }
}

void RenderViewImpl::OnSelectAll() {
  if (!webview())
    return;

  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  webview()->focusedFrame()->executeCommand(
      WebString::fromUTF8("SelectAll"), GetFocusedNode());
}

void RenderViewImpl::OnSelectRange(const gfx::Point& start,
                                   const gfx::Point& end) {
  if (!webview())
    return;

  Send(new ViewHostMsg_SelectRange_ACK(routing_id_));

  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  webview()->focusedFrame()->selectRange(start, end);
}

void RenderViewImpl::OnSetEditCommandsForNextKeyEvent(
    const EditCommands& edit_commands) {
  edit_commands_ = edit_commands;
}

void RenderViewImpl::OnUndo() {
  if (!webview())
    return;

  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Undo"),
                                            GetFocusedNode());
}

void RenderViewImpl::OnUnselect() {
  if (!webview())
    return;

  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Unselect"),
                                            GetFocusedNode());
}

#if defined(OS_MACOSX)
void RenderViewImpl::OnCopyToFindPboard() {
  if (!webview())
    return;

  // Since the find pasteboard supports only plain text, this can be simpler
  // than the |OnCopy()| case.
  WebFrame* frame = webview()->focusedFrame();
  if (frame->hasSelection()) {
    base::string16 selection = frame->selectionAsText();
    RenderThread::Get()->Send(
        new ClipboardHostMsg_FindPboardWriteStringAsync(selection));
  }
}
#endif

void RenderViewImpl::OnSetName(const std::string& name) {
  if (!webview())
    return;

  webview()->mainFrame()->setName(WebString::fromUTF8(name));
}

void RenderViewImpl::OnSetEditableSelectionOffsets(int start, int end) {
  base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
  if (!ShouldHandleImeEvent())
    return;
  ImeEventGuard guard(this);
  webview()->setEditableSelectionOffsets(start, end);
}

void RenderViewImpl::OnSetCompositionFromExistingText(
    int start, int end,
    const std::vector<blink::WebCompositionUnderline>& underlines) {
  if (!ShouldHandleImeEvent())
    return;
  ImeEventGuard guard(this);
  webview()->setCompositionFromExistingText(start, end, underlines);
}

void RenderViewImpl::OnExtendSelectionAndDelete(int before, int after) {
  if (!ShouldHandleImeEvent())
    return;
  ImeEventGuard guard(this);
  webview()->extendSelectionAndDelete(before, after);
}

void RenderViewImpl::OnSetHistoryLengthAndPrune(int history_length,
                                                int32 minimum_page_id) {
  DCHECK_GE(history_length, 0);
  DCHECK(history_list_offset_ == history_list_length_ - 1);
  DCHECK_GE(minimum_page_id, -1);

  // Generate the new list.
  std::vector<int32> new_history_page_ids(history_length, -1);
  for (size_t i = 0; i < history_page_ids_.size(); ++i) {
    if (minimum_page_id >= 0 && history_page_ids_[i] < minimum_page_id)
      continue;
    new_history_page_ids.push_back(history_page_ids_[i]);
  }
  new_history_page_ids.swap(history_page_ids_);

  // Update indexes.
  history_list_length_ = history_page_ids_.size();
  history_list_offset_ = history_list_length_ - 1;
}


void RenderViewImpl::OnSetInitialFocus(bool reverse) {
  if (!webview())
    return;
  webview()->setInitialFocus(reverse);
}

#if defined(OS_MACOSX)
void RenderViewImpl::OnSetInLiveResize(bool in_live_resize) {
  if (!webview())
    return;
  if (in_live_resize)
    webview()->willStartLiveResize();
  else
    webview()->willEndLiveResize();
}
#endif

#if defined(OS_ANDROID)
void RenderViewImpl::OnUndoScrollFocusedEditableNodeIntoRect() {
  const WebNode node = GetFocusedNode();
  if (!node.isNull() && IsEditableNode(node))
    webview()->restoreScrollAndScaleState();
}

void RenderViewImpl::OnPauseVideo() {
  // Inform RendererMediaPlayerManager to release all video player resources.
  // If something is in progress the resource will not be freed, it will
  // only be freed once the tab is destroyed or if the user navigates away
  // via WebMediaPlayerAndroid::Destroy.
  media_player_manager_->ReleaseVideoResources();
}
#endif

///////////////////////////////////////////////////////////////////////////////

// Tell the embedding application that the URL of the active page has changed
void RenderViewImpl::UpdateURL(WebFrame* frame) {
  WebDataSource* ds = frame->dataSource();
  DCHECK(ds);

  const WebURLRequest& request = ds->request();
  const WebURLRequest& original_request = ds->originalRequest();
  const WebURLResponse& response = ds->response();

  DocumentState* document_state = DocumentState::FromDataSource(ds);
  NavigationState* navigation_state = document_state->navigation_state();
  InternalDocumentStateData* internal_data =
      InternalDocumentStateData::FromDocumentState(document_state);

  ViewHostMsg_FrameNavigate_Params params;
  params.http_status_code = response.httpStatusCode();
  params.is_post = false;
  params.post_id = -1;
  params.page_id = page_id_;
  params.frame_id = frame->identifier();
  params.frame_unique_name = frame->uniqueName();
  params.socket_address.set_host(response.remoteIPAddress().utf8());
  params.socket_address.set_port(response.remotePort());
  WebURLResponseExtraDataImpl* extra_data = GetExtraDataFromResponse(response);
  if (extra_data) {
    params.was_fetched_via_proxy = extra_data->was_fetched_via_proxy();
  }
  params.was_within_same_page = navigation_state->was_within_same_page();
  params.security_info = response.securityInfo();

  // Set the URL to be displayed in the browser UI to the user.
  params.url = GetLoadingUrl(frame);
  DCHECK(!is_swapped_out_ || params.url == GURL(kSwappedOutURL));

  if (frame->document().baseURL() != params.url)
    params.base_url = frame->document().baseURL();

  GetRedirectChain(ds, &params.redirects);
  params.should_update_history = !ds->hasUnreachableURL() &&
      !response.isMultipartPayload() && (response.httpStatusCode() != 404);

  params.searchable_form_url = internal_data->searchable_form_url();
  params.searchable_form_encoding = internal_data->searchable_form_encoding();

  params.gesture = navigation_gesture_;
  navigation_gesture_ = NavigationGestureUnknown;

  // Make navigation state a part of the FrameNavigate message so that commited
  // entry had it at all times.
  WebHistoryItem item = frame->currentHistoryItem();
  if (item.isNull()) {
    item.initialize();
    item.setURLString(request.url().spec().utf16());
  }
  params.page_state = HistoryItemToPageState(item);

  if (!frame->parent()) {
    // Top-level navigation.

    // Reset the zoom limits in case a plugin had changed them previously. This
    // will also call us back which will cause us to send a message to
    // update WebContentsImpl.
    webview()->zoomLimitsChanged(ZoomFactorToZoomLevel(kMinimumZoomFactor),
                                 ZoomFactorToZoomLevel(kMaximumZoomFactor));

    // Set zoom level, but don't do it for full-page plugin since they don't use
    // the same zoom settings.
    HostZoomLevels::iterator host_zoom =
        host_zoom_levels_.find(GURL(request.url()));
    if (webview()->mainFrame()->document().isPluginDocument()) {
      // Reset the zoom levels for plugins.
      webview()->setZoomLevel(0);
    } else {
      if (host_zoom != host_zoom_levels_.end())
        webview()->setZoomLevel(host_zoom->second);
    }

    if (host_zoom != host_zoom_levels_.end()) {
      // This zoom level was merely recorded transiently for this load.  We can
      // erase it now.  If at some point we reload this page, the browser will
      // send us a new, up-to-date zoom level.
      host_zoom_levels_.erase(host_zoom);
    }

    // Update contents MIME type for main frame.
    params.contents_mime_type = ds->response().mimeType().utf8();

    params.transition = navigation_state->transition_type();
    if (!PageTransitionIsMainFrame(params.transition)) {
      // If the main frame does a load, it should not be reported as a subframe
      // navigation.  This can occur in the following case:
      // 1. You're on a site with frames.
      // 2. You do a subframe navigation.  This is stored with transition type
      //    MANUAL_SUBFRAME.
      // 3. You navigate to some non-frame site, say, google.com.
      // 4. You navigate back to the page from step 2.  Since it was initially
      //    MANUAL_SUBFRAME, it will be that same transition type here.
      // We don't want that, because any navigation that changes the toplevel
      // frame should be tracked as a toplevel navigation (this allows us to
      // update the URL bar, etc).
      params.transition = PAGE_TRANSITION_LINK;
    }

    // If the page contained a client redirect (meta refresh, document.loc...),
    // set the referrer and transition appropriately.
    if (ds->isClientRedirect()) {
      params.referrer = Referrer(params.redirects[0],
          GetReferrerPolicyFromRequest(frame, ds->request()));
      params.transition = static_cast<PageTransition>(
          params.transition | PAGE_TRANSITION_CLIENT_REDIRECT);
    } else {
      // Bug 654101: the referrer will be empty on https->http transitions. It
      // would be nice if we could get the real referrer from somewhere.
      params.referrer = GetReferrerFromRequest(frame, original_request);
    }

    base::string16 method = request.httpMethod();
    if (EqualsASCII(method, "POST")) {
      params.is_post = true;
      params.post_id = ExtractPostId(item);
    }

    // Send the user agent override back.
    params.is_overriding_user_agent = internal_data->is_overriding_user_agent();

    // Track the URL of the original request.  We use the first entry of the
    // redirect chain if it exists because the chain may have started in another
    // process.
    params.original_request_url = GetOriginalRequestURL(ds);

    params.history_list_was_cleared =
        navigation_state->history_list_was_cleared();

    // Save some histogram data so we can compute the average memory used per
    // page load of the glyphs.
    UMA_HISTOGRAM_COUNTS_10000("Memory.GlyphPagesPerLoad",
                               blink::WebGlyphCache::pageCount());

    // This message needs to be sent before any of allowScripts(),
    // allowImages(), allowPlugins() is called for the new page, so that when
    // these functions send a ViewHostMsg_ContentBlocked message, it arrives
    // after the ViewHostMsg_FrameNavigate message.
    Send(new ViewHostMsg_FrameNavigate(routing_id_, params));
  } else {
    // Subframe navigation: the type depends on whether this navigation
    // generated a new session history entry. When they do generate a session
    // history entry, it means the user initiated the navigation and we should
    // mark it as such. This test checks if this is the first time UpdateURL
    // has been called since WillNavigateToURL was called to initiate the load.
    if (page_id_ > last_page_id_sent_to_browser_)
      params.transition = PAGE_TRANSITION_MANUAL_SUBFRAME;
    else
      params.transition = PAGE_TRANSITION_AUTO_SUBFRAME;

    DCHECK(!navigation_state->history_list_was_cleared());
    params.history_list_was_cleared = false;

    Send(new ViewHostMsg_FrameNavigate(routing_id_, params));
  }

  last_page_id_sent_to_browser_ =
      std::max(last_page_id_sent_to_browser_, page_id_);

  // If we end up reusing this WebRequest (for example, due to a #ref click),
  // we don't want the transition type to persist.  Just clear it.
  navigation_state->set_transition_type(PAGE_TRANSITION_LINK);
}

// Tell the embedding application that the title of the active page has changed
void RenderViewImpl::UpdateTitle(WebFrame* frame,
                                 const base::string16& title,
                                 WebTextDirection title_direction) {
  // Ignore all but top level navigations.
  if (frame->parent())
    return;

  base::debug::TraceLog::GetInstance()->UpdateProcessLabel(
      routing_id_, UTF16ToUTF8(title));

  base::string16 shortened_title = title.substr(0, kMaxTitleChars);
  Send(new ViewHostMsg_UpdateTitle(routing_id_, page_id_, shortened_title,
                                   title_direction));
}

void RenderViewImpl::UpdateEncoding(WebFrame* frame,
                                    const std::string& encoding_name) {
  // Only update main frame's encoding_name.
  if (webview()->mainFrame() == frame &&
      last_encoding_name_ != encoding_name) {
    // Save the encoding name for later comparing.
    last_encoding_name_ = encoding_name;

    Send(new ViewHostMsg_UpdateEncoding(routing_id_, last_encoding_name_));
  }
}

// Sends the last committed session history state to the browser so it will be
// saved before we navigate to a new page. This must be called *before* the
// page ID has been updated so we know what it was.
void RenderViewImpl::UpdateSessionHistory(WebFrame* frame) {
  // If we have a valid page ID at this point, then it corresponds to the page
  // we are navigating away from.  Otherwise, this is the first navigation, so
  // there is no past session history to record.
  if (page_id_ == -1)
    return;

  const WebHistoryItem& item =
      webview()->mainFrame()->previousHistoryItem();
  SendUpdateState(item);
}

void RenderViewImpl::SendUpdateState(const WebHistoryItem& item) {
  if (item.isNull())
    return;

  // Don't send state updates for kSwappedOutURL.
  if (item.urlString() == WebString::fromUTF8(kSwappedOutURL))
    return;

  Send(new ViewHostMsg_UpdateState(
      routing_id_, page_id_, HistoryItemToPageState(item)));
}

void RenderViewImpl::OpenURL(WebFrame* frame,
                             const GURL& url,
                             const Referrer& referrer,
                             WebNavigationPolicy policy) {
  ViewHostMsg_OpenURL_Params params;
  params.url = url;
  params.referrer = referrer;
  params.disposition = NavigationPolicyToDisposition(policy);
  params.frame_id = frame->identifier();
  WebDataSource* ds = frame->provisionalDataSource();
  if (ds) {
    DocumentState* document_state = DocumentState::FromDataSource(ds);
    NavigationState* navigation_state = document_state->navigation_state();
    if (navigation_state->is_content_initiated()) {
      params.should_replace_current_entry = ds->replacesCurrentHistoryItem();
    } else {
      // This is necessary to preserve the should_replace_current_entry value on
      // cross-process redirects, in the event it was set by a previous process.
      //
      // TODO(davidben): Avoid this awkward duplication of state. See comment on
      // NavigationState::should_replace_current_entry().
      params.should_replace_current_entry =
          navigation_state->should_replace_current_entry();
    }
  } else {
    params.should_replace_current_entry = false;
  }
  params.user_gesture = WebUserGestureIndicator::isProcessingUserGesture();
  if (GetContentClient()->renderer()->AllowPopup())
    params.user_gesture = true;

  if (policy == blink::WebNavigationPolicyNewBackgroundTab ||
      policy == blink::WebNavigationPolicyNewForegroundTab ||
      policy == blink::WebNavigationPolicyNewWindow ||
      policy == blink::WebNavigationPolicyNewPopup) {
    WebUserGestureIndicator::consumeUserGesture();
  }

  Send(new ViewHostMsg_OpenURL(routing_id_, params));
}

// WebViewDelegate ------------------------------------------------------------

void RenderViewImpl::LoadNavigationErrorPage(
    WebFrame* frame,
    const WebURLRequest& failed_request,
    const WebURLError& error,
    const std::string& html,
    bool replace) {
  std::string alt_html;
  const std::string* error_html;

  if (!html.empty()) {
    error_html = &html;
  } else {
    GetContentClient()->renderer()->GetNavigationErrorStrings(
        frame, failed_request, error, renderer_preferences_.accept_languages,
        &alt_html, NULL);
    error_html = &alt_html;
  }

  frame->loadHTMLString(*error_html,
                        GURL(kUnreachableWebDataURL),
                        error.unreachableURL,
                        replace);
}

bool RenderViewImpl::RunJavaScriptMessage(JavaScriptMessageType type,
                                          const base::string16& message,
                                          const base::string16& default_value,
                                          const GURL& frame_url,
                                          base::string16* result) {
  // Don't allow further dialogs if we are waiting to swap out, since the
  // PageGroupLoadDeferrer in our stack prevents it.
  if (suppress_dialogs_until_swap_out_)
    return false;

  bool success = false;
  base::string16 result_temp;
  if (!result)
    result = &result_temp;

  SendAndRunNestedMessageLoop(new ViewHostMsg_RunJavaScriptMessage(
      routing_id_, message, default_value, frame_url, type, &success, result));
  return success;
}

bool RenderViewImpl::SendAndRunNestedMessageLoop(IPC::SyncMessage* message) {
  // Before WebKit asks us to show an alert (etc.), it takes care of doing the
  // equivalent of WebView::willEnterModalLoop.  In the case of showModalDialog
  // it is particularly important that we do not call willEnterModalLoop as
  // that would defer resource loads for the dialog itself.
  if (RenderThreadImpl::current())  // Will be NULL during unit tests.
    RenderThreadImpl::current()->DoNotNotifyWebKitOfModalLoop();

  message->EnableMessagePumping();  // Runs a nested message loop.
  return Send(message);
}

void RenderViewImpl::GetWindowSnapshot(const WindowSnapshotCallback& callback) {
  int id = next_snapshot_id_++;
  pending_snapshots_.insert(std::make_pair(id, callback));
  ui::LatencyInfo latency_info;
  latency_info.AddLatencyNumber(ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT,
                                GetLatencyComponentId(),
                                id);
  scoped_ptr<cc::SwapPromiseMonitor> latency_info_swap_promise_monitor;
  if (RenderWidgetCompositor* rwc = compositor()) {
    latency_info_swap_promise_monitor =
        rwc->CreateLatencyInfoSwapPromiseMonitor(&latency_info).Pass();
  } else {
    latency_info_.MergeWith(latency_info);
  }
  ScheduleCompositeWithForcedRedraw();
}

void RenderViewImpl::OnWindowSnapshotCompleted(const int snapshot_id,
    const gfx::Size& size, const std::vector<unsigned char>& png) {

  // Any pending snapshots with a lower ID than the one received are considered
  // to be implicitly complete, and returned the same snapshot data.
  PendingSnapshotMap::iterator it = pending_snapshots_.begin();
  while(it != pending_snapshots_.end()) {
      if (it->first <= snapshot_id) {
        it->second.Run(size, png);
        pending_snapshots_.erase(it++);
      } else {
        ++it;
      }
  }
}

// blink::WebViewClient ------------------------------------------------------

WebView* RenderViewImpl::createView(
    WebFrame* creator,
    const WebURLRequest& request,
    const WebWindowFeatures& features,
    const WebString& frame_name,
    WebNavigationPolicy policy,
    bool suppress_opener) {
  ViewHostMsg_CreateWindow_Params params;
  params.opener_id = routing_id_;
  params.user_gesture = WebUserGestureIndicator::isProcessingUserGesture();
  if (GetContentClient()->renderer()->AllowPopup())
    params.user_gesture = true;
  params.window_container_type = WindowFeaturesToContainerType(features);
  params.session_storage_namespace_id = session_storage_namespace_id_;
  if (frame_name != "_blank")
    params.frame_name = frame_name;
  params.opener_frame_id = creator->identifier();
  params.opener_url = creator->document().url();
  params.opener_top_level_frame_url = creator->top()->document().url();
  GURL security_url(creator->document().securityOrigin().toString().utf8());
  if (!security_url.is_valid())
    security_url = GURL();
  params.opener_security_origin = security_url;
  params.opener_suppressed = suppress_opener;
  params.disposition = NavigationPolicyToDisposition(policy);
  if (!request.isNull()) {
    params.target_url = request.url();
    params.referrer = GetReferrerFromRequest(creator, request);
  }
  params.features = features;

  for (size_t i = 0; i < features.additionalFeatures.size(); ++i)
    params.additional_features.push_back(features.additionalFeatures[i]);

  int32 routing_id = MSG_ROUTING_NONE;
  int32 main_frame_routing_id = MSG_ROUTING_NONE;
  int32 surface_id = 0;
  int64 cloned_session_storage_namespace_id;

  RenderThread::Get()->Send(
      new ViewHostMsg_CreateWindow(params,
                                   &routing_id,
                                   &main_frame_routing_id,
                                   &surface_id,
                                   &cloned_session_storage_namespace_id));
  if (routing_id == MSG_ROUTING_NONE)
    return NULL;

  WebUserGestureIndicator::consumeUserGesture();

  WebPreferences transferred_preferences = webkit_preferences_;

  // Unless accelerated compositing has been explicitly disabled from the
  // command line (e.g. via the blacklist or about:flags) re-enable it for
  // new views that get spawned by this view. This gets around the issue that
  // background extension pages disable accelerated compositing via web prefs
  // but can themselves spawn a visible render view which should be allowed
  // use gpu acceleration.
  if (!webkit_preferences_.accelerated_compositing_enabled) {
    const CommandLine& command_line = *CommandLine::ForCurrentProcess();
    if (!command_line.HasSwitch(switches::kDisableAcceleratedCompositing))
      transferred_preferences.accelerated_compositing_enabled = true;
  }

  // The initial hidden state for the RenderViewImpl here has to match what the
  // browser will eventually decide for the given disposition. Since we have to
  // return from this call synchronously, we just have to make our best guess
  // and rely on the browser sending a WasHidden / WasShown message if it
  // disagrees.
  RenderViewImpl* view = RenderViewImpl::Create(
      routing_id_,
      renderer_preferences_,
      transferred_preferences,
      routing_id,
      main_frame_routing_id,
      surface_id,
      cloned_session_storage_namespace_id,
      base::string16(),  // WebCore will take care of setting the correct name.
      true,  // is_renderer_created
      false, // swapped_out
      params.disposition == NEW_BACKGROUND_TAB, // hidden
      1,     // next_page_id
      screen_info_,
      accessibility_mode_,
      allow_partial_swap_);
  view->opened_by_user_gesture_ = params.user_gesture;

  // Record whether the creator frame is trying to suppress the opener field.
  view->opener_suppressed_ = params.opener_suppressed;

  // Copy over the alternate error page URL so we can have alt error pages in
  // the new render view (we don't need the browser to send the URL back down).
  view->alternate_error_page_url_ = alternate_error_page_url_;

  return view->webview();
}

WebWidget* RenderViewImpl::createPopupMenu(blink::WebPopupType popup_type) {
  RenderWidget* widget =
      RenderWidget::Create(routing_id_, popup_type, screen_info_);
  if (screen_metrics_emulator_) {
    widget->SetPopupOriginAdjustmentsForEmulation(
        screen_metrics_emulator_.get());
  }
  return widget->webwidget();
}

WebExternalPopupMenu* RenderViewImpl::createExternalPopupMenu(
    const WebPopupMenuInfo& popup_menu_info,
    WebExternalPopupMenuClient* popup_menu_client) {
  // An IPC message is sent to the browser to build and display the actual
  // popup.  The user could have time to click a different select by the time
  // the popup is shown.  In that case external_popup_menu_ is non NULL.
  // By returning NULL in that case, we instruct WebKit to cancel that new
  // popup.  So from the user perspective, only the first one will show, and
  // will have to close the first one before another one can be shown.
  if (external_popup_menu_)
    return NULL;
  external_popup_menu_.reset(
      new ExternalPopupMenu(this, popup_menu_info, popup_menu_client));
  if (screen_metrics_emulator_) {
    SetExternalPopupOriginAdjustmentsForEmulation(
        external_popup_menu_.get(), screen_metrics_emulator_.get());
  }
  return external_popup_menu_.get();
}

WebStorageNamespace* RenderViewImpl::createSessionStorageNamespace() {
  CHECK(session_storage_namespace_id_ != kInvalidSessionStorageNamespaceId);
  return new WebStorageNamespaceImpl(session_storage_namespace_id_);
}

bool RenderViewImpl::shouldReportDetailedMessageForSource(
    const WebString& source) {
  return GetContentClient()->renderer()->ShouldReportDetailedMessageForSource(
      source);
}

void RenderViewImpl::didAddMessageToConsole(
    const WebConsoleMessage& message, const WebString& source_name,
    unsigned source_line, const WebString& stack_trace) {
  logging::LogSeverity log_severity = logging::LOG_VERBOSE;
  switch (message.level) {
    case WebConsoleMessage::LevelDebug:
      log_severity = logging::LOG_VERBOSE;
      break;
    case WebConsoleMessage::LevelLog:
    case WebConsoleMessage::LevelInfo:
      log_severity = logging::LOG_INFO;
      break;
    case WebConsoleMessage::LevelWarning:
      log_severity = logging::LOG_WARNING;
      break;
    case WebConsoleMessage::LevelError:
      log_severity = logging::LOG_ERROR;
      break;
    default:
      NOTREACHED();
  }

  if (shouldReportDetailedMessageForSource(source_name)) {
    FOR_EACH_OBSERVER(
        RenderViewObserver,
        observers_,
        DetailedConsoleMessageAdded(message.text,
                                    source_name,
                                    stack_trace,
                                    source_line,
                                    static_cast<int32>(log_severity)));
  }

  Send(new ViewHostMsg_AddMessageToConsole(routing_id_,
                                           static_cast<int32>(log_severity),
                                           message.text,
                                           static_cast<int32>(source_line),
                                           source_name));
}

void RenderViewImpl::printPage(WebFrame* frame) {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                    PrintPage(frame, handling_input_event_));
}

blink::WebNotificationPresenter* RenderViewImpl::notificationPresenter() {
  return notification_provider_;
}

bool RenderViewImpl::enumerateChosenDirectory(
    const WebString& path,
    WebFileChooserCompletion* chooser_completion) {
  int id = enumeration_completion_id_++;
  enumeration_completions_[id] = chooser_completion;
  return Send(new ViewHostMsg_EnumerateDirectory(
      routing_id_,
      id,
      base::FilePath::FromUTF16Unsafe(path)));
}

void RenderViewImpl::initializeHelperPluginWebFrame(
    blink::WebHelperPlugin* plugin) {
  plugin->initializeFrame(main_render_frame_.get());
}

void RenderViewImpl::didStartLoading() {
  if (is_loading_) {
    DVLOG(1) << "didStartLoading called while loading";
    return;
  }

  is_loading_ = true;

  Send(new ViewHostMsg_DidStartLoading(routing_id_));

  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidStartLoading());
}

void RenderViewImpl::didStopLoading() {
  if (!is_loading_) {
    DVLOG(1) << "DidStopLoading called while not loading";
    return;
  }

  is_loading_ = false;

  // NOTE: For now we're doing the safest thing, and sending out notification
  // when done loading. This currently isn't an issue as the favicon is only
  // displayed when done loading. Ideally we would send notification when
  // finished parsing the head, but webkit doesn't support that yet.
  // The feed discovery code would also benefit from access to the head.
  Send(new ViewHostMsg_DidStopLoading(routing_id_));

  if (load_progress_tracker_ != NULL)
    load_progress_tracker_->DidStopLoading();

  DidStopLoadingIcons();

  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidStopLoading());
}

void RenderViewImpl::didChangeLoadProgress(WebFrame* frame,
                                           double load_progress) {
  if (load_progress_tracker_ != NULL)
    load_progress_tracker_->DidChangeLoadProgress(frame, load_progress);
}

void RenderViewImpl::didCancelCompositionOnSelectionChange() {
  Send(new ViewHostMsg_ImeCancelComposition(routing_id()));
}

void RenderViewImpl::didChangeSelection(bool is_empty_selection) {
  if (!handling_input_event_ && !handling_select_range_)
    return;

  if (is_empty_selection)
    selection_text_.clear();

  // UpdateTextInputType should be called before SyncSelectionIfRequired.
  // UpdateTextInputType may send TextInputTypeChanged to notify the focus
  // was changed, and SyncSelectionIfRequired may send SelectionChanged
  // to notify the selection was changed.  Focus change should be notified
  // before selection change.
  UpdateTextInputType();
  SyncSelectionIfRequired();
#if defined(OS_ANDROID)
  UpdateTextInputState(false, true);
#endif
}

void RenderViewImpl::didExecuteCommand(const WebString& command_name) {
  const std::string& name = UTF16ToUTF8(command_name);
  if (StartsWithASCII(name, "Move", true) ||
      StartsWithASCII(name, "Insert", true) ||
      StartsWithASCII(name, "Delete", true))
    return;
  RenderThreadImpl::current()->RecordComputedAction(name);
}

bool RenderViewImpl::handleCurrentKeyboardEvent() {
  if (edit_commands_.empty())
    return false;

  WebFrame* frame = webview()->focusedFrame();
  if (!frame)
    return false;

  EditCommands::iterator it = edit_commands_.begin();
  EditCommands::iterator end = edit_commands_.end();

  bool did_execute_command = false;
  for (; it != end; ++it) {
    // In gtk and cocoa, it's possible to bind multiple edit commands to one
    // key (but it's the exception). Once one edit command is not executed, it
    // seems safest to not execute the rest.
    if (!frame->executeCommand(WebString::fromUTF8(it->name),
                               WebString::fromUTF8(it->value),
                               GetFocusedNode()))
      break;
    did_execute_command = true;
  }

  return did_execute_command;
}

blink::WebColorChooser* RenderViewImpl::createColorChooser(
    blink::WebColorChooserClient* client,
    const blink::WebColor& initial_color,
    const blink::WebVector<blink::WebColorSuggestion>& suggestions) {
  RendererWebColorChooserImpl* color_chooser =
      new RendererWebColorChooserImpl(this, client);
  std::vector<content::ColorSuggestion> color_suggestions;
  for (size_t i = 0; i < suggestions.size(); i++) {
    color_suggestions.push_back(content::ColorSuggestion(suggestions[i]));
  }
  color_chooser->Open(static_cast<SkColor>(initial_color), color_suggestions);
  return color_chooser;
}

bool RenderViewImpl::runFileChooser(
    const blink::WebFileChooserParams& params,
    WebFileChooserCompletion* chooser_completion) {
  // Do not open the file dialog in a hidden RenderView.
  if (is_hidden())
    return false;
  FileChooserParams ipc_params;
  if (params.directory)
    ipc_params.mode = FileChooserParams::UploadFolder;
  else if (params.multiSelect)
    ipc_params.mode = FileChooserParams::OpenMultiple;
  else if (params.saveAs)
    ipc_params.mode = FileChooserParams::Save;
  else
    ipc_params.mode = FileChooserParams::Open;
  ipc_params.title = params.title;
  ipc_params.default_file_name =
      base::FilePath::FromUTF16Unsafe(params.initialValue);
  ipc_params.accept_types.reserve(params.acceptTypes.size());
  for (size_t i = 0; i < params.acceptTypes.size(); ++i)
    ipc_params.accept_types.push_back(params.acceptTypes[i]);
#if defined(OS_ANDROID)
  ipc_params.capture = params.useMediaCapture;
#endif

  return ScheduleFileChooser(ipc_params, chooser_completion);
}

void RenderViewImpl::runModalAlertDialog(WebFrame* frame,
                                         const WebString& message) {
  RunJavaScriptMessage(JAVASCRIPT_MESSAGE_TYPE_ALERT,
                       message,
                       base::string16(),
                       frame->document().url(),
                       NULL);
}

bool RenderViewImpl::runModalConfirmDialog(WebFrame* frame,
                                           const WebString& message) {
  return RunJavaScriptMessage(JAVASCRIPT_MESSAGE_TYPE_CONFIRM,
                              message,
                              base::string16(),
                              frame->document().url(),
                              NULL);
}

bool RenderViewImpl::runModalPromptDialog(WebFrame* frame,
                                          const WebString& message,
                                          const WebString& default_value,
                                          WebString* actual_value) {
  base::string16 result;
  bool ok = RunJavaScriptMessage(JAVASCRIPT_MESSAGE_TYPE_PROMPT,
                                 message,
                                 default_value,
                                 frame->document().url(),
                                 &result);
  if (ok)
    actual_value->assign(result);
  return ok;
}

bool RenderViewImpl::runModalBeforeUnloadDialog(
    WebFrame* frame, const WebString& message) {
  bool is_reload = false;
  WebDataSource* ds = frame->provisionalDataSource();
  if (ds)
    is_reload = (ds->navigationType() == blink::WebNavigationTypeReload);
  return runModalBeforeUnloadDialog(frame, is_reload, message);
}

bool RenderViewImpl::runModalBeforeUnloadDialog(
    WebFrame* frame, bool is_reload, const WebString& message) {
  // If we are swapping out, we have already run the beforeunload handler.
  // TODO(creis): Fix OnSwapOut to clear the frame without running beforeunload
  // at all, to avoid running it twice.
  if (is_swapped_out_)
    return true;

  // Don't allow further dialogs if we are waiting to swap out, since the
  // PageGroupLoadDeferrer in our stack prevents it.
  if (suppress_dialogs_until_swap_out_)
    return false;

  bool success = false;
  // This is an ignored return value, but is included so we can accept the same
  // response as RunJavaScriptMessage.
  base::string16 ignored_result;
  SendAndRunNestedMessageLoop(new ViewHostMsg_RunBeforeUnloadConfirm(
      routing_id_, frame->document().url(), message, is_reload,
      &success, &ignored_result));
  return success;
}

void RenderViewImpl::showValidationMessage(
    const blink::WebRect& anchor_in_root_view,
    const blink::WebString& main_text,
    const blink::WebString& sub_text,
    blink::WebTextDirection hint) {
  base::string16 wrapped_main_text = main_text;
  base::string16 wrapped_sub_text = sub_text;
  if (hint == blink::WebTextDirectionLeftToRight) {
    wrapped_main_text =
        base::i18n::GetDisplayStringInLTRDirectionality(wrapped_main_text);
    if (!wrapped_sub_text.empty()) {
      wrapped_sub_text =
          base::i18n::GetDisplayStringInLTRDirectionality(wrapped_sub_text);
    }
  } else if (hint == blink::WebTextDirectionRightToLeft
             && !base::i18n::IsRTL()) {
    base::i18n::WrapStringWithRTLFormatting(&wrapped_main_text);
    if (!wrapped_sub_text.empty()) {
      base::i18n::WrapStringWithRTLFormatting(&wrapped_sub_text);
    }
  }
  Send(new ViewHostMsg_ShowValidationMessage(
    routing_id(), anchor_in_root_view, wrapped_main_text, wrapped_sub_text));
}

void RenderViewImpl::hideValidationMessage() {
  Send(new ViewHostMsg_HideValidationMessage(routing_id()));
}

void RenderViewImpl::moveValidationMessage(
    const blink::WebRect& anchor_in_root_view) {
  Send(new ViewHostMsg_MoveValidationMessage(routing_id(),
                                             anchor_in_root_view));
}

void RenderViewImpl::showContextMenu(
    WebFrame* frame, const WebContextMenuData& data) {
  ContextMenuParams params = ContextMenuParamsBuilder::Build(data);
  params.source_type = context_menu_source_type_;
  if (context_menu_source_type_ == ui::MENU_SOURCE_TOUCH_EDIT_MENU) {
    params.x = touch_editing_context_menu_location_.x();
    params.y = touch_editing_context_menu_location_.y();
  }
  OnShowHostContextMenu(&params);

  // Plugins, e.g. PDF, don't currently update the render view when their
  // selected text changes, but the context menu params do contain the updated
  // selection. If that's the case, update the render view's state just prior
  // to showing the context menu.
  // TODO(asvitkine): http://crbug.com/152432
  if (ShouldUpdateSelectionTextFromContextMenuParams(selection_text_,
                                                     selection_text_offset_,
                                                     selection_range_,
                                                     params)) {
    selection_text_ = params.selection_text;
    // TODO(asvitkine): Text offset and range is not available in this case.
    selection_text_offset_ = 0;
    selection_range_ = gfx::Range(0, selection_text_.length());
    Send(new ViewHostMsg_SelectionChanged(routing_id_,
                                          selection_text_,
                                          selection_text_offset_,
                                          selection_range_));
  }

  // frame is NULL if invoked by BlockedPlugin.
  if (frame)
    params.frame_id = frame->identifier();

  // Serializing a GURL longer than kMaxURLChars will fail, so don't do
  // it.  We replace it with an empty GURL so the appropriate items are disabled
  // in the context menu.
  // TODO(jcivelli): http://crbug.com/45160 This prevents us from saving large
  //                 data encoded images.  We should have a way to save them.
  if (params.src_url.spec().size() > GetMaxURLChars())
    params.src_url = GURL();
  context_menu_node_ = data.node;

#if defined(OS_ANDROID)
  gfx::Rect start_rect;
  gfx::Rect end_rect;
  GetSelectionBounds(&start_rect, &end_rect);
  params.selection_start = gfx::Point(start_rect.x(), start_rect.bottom());
  params.selection_end = gfx::Point(end_rect.right(), end_rect.bottom());
#endif

  Send(new ViewHostMsg_ContextMenu(routing_id_, params));

  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_, DidRequestShowContextMenu(frame, data));
}

void RenderViewImpl::clearContextMenu() {
  context_menu_node_.reset();
}

void RenderViewImpl::setStatusText(const WebString& text) {
}

void RenderViewImpl::UpdateTargetURL(const GURL& url,
                                     const GURL& fallback_url) {
  GURL latest_url = url.is_empty() ? fallback_url : url;
  if (latest_url == target_url_)
    return;

  // Tell the browser to display a destination link.
  if (target_url_status_ == TARGET_INFLIGHT ||
      target_url_status_ == TARGET_PENDING) {
    // If we have a request in-flight, save the URL to be sent when we
    // receive an ACK to the in-flight request. We can happily overwrite
    // any existing pending sends.
    pending_target_url_ = latest_url;
    target_url_status_ = TARGET_PENDING;
  } else {
    // URLs larger than |MaxURLChars()| cannot be sent through IPC -
    // see |ParamTraits<GURL>|.
    if (latest_url.possibly_invalid_spec().size() > GetMaxURLChars())
      latest_url = GURL();
    Send(new ViewHostMsg_UpdateTargetURL(routing_id_, page_id_, latest_url));
    target_url_ = latest_url;
    target_url_status_ = TARGET_INFLIGHT;
  }
}

gfx::RectF RenderViewImpl::ClientRectToPhysicalWindowRect(
    const gfx::RectF& rect) const {
  gfx::RectF window_rect = rect;
  window_rect.Scale(device_scale_factor_ * webview()->pageScaleFactor());
  return window_rect;
}

int64 RenderViewImpl::GetLatencyComponentId() {
  // Note: this must match the logic in RenderWidgetHostImpl.
  return GetRoutingID() | (static_cast<int64>(
      RenderThreadImpl::current()->renderer_process_id()) << 32);
}

void RenderViewImpl::StartNavStateSyncTimerIfNecessary() {
  // No need to update state if no page has committed yet.
  if (page_id_ == -1)
    return;

  int delay;
  if (send_content_state_immediately_)
    delay = 0;
  else if (is_hidden())
    delay = kDelaySecondsForContentStateSyncHidden;
  else
    delay = kDelaySecondsForContentStateSync;

  if (nav_state_sync_timer_.IsRunning()) {
    // The timer is already running. If the delay of the timer maches the amount
    // we want to delay by, then return. Otherwise stop the timer so that it
    // gets started with the right delay.
    if (nav_state_sync_timer_.GetCurrentDelay().InSeconds() == delay)
      return;
    nav_state_sync_timer_.Stop();
  }

  nav_state_sync_timer_.Start(FROM_HERE, TimeDelta::FromSeconds(delay), this,
                              &RenderViewImpl::SyncNavigationState);
}

void RenderViewImpl::setMouseOverURL(const WebURL& url) {
  mouse_over_url_ = GURL(url);
  UpdateTargetURL(mouse_over_url_, focus_url_);
}

void RenderViewImpl::setKeyboardFocusURL(const WebURL& url) {
  focus_url_ = GURL(url);
  UpdateTargetURL(focus_url_, mouse_over_url_);
}

void RenderViewImpl::startDragging(WebFrame* frame,
                                   const WebDragData& data,
                                   WebDragOperationsMask mask,
                                   const WebImage& image,
                                   const WebPoint& webImageOffset) {
  DropData drop_data(DropDataBuilder::Build(data));
  drop_data.referrer_policy = frame->document().referrerPolicy();
  gfx::Vector2d imageOffset(webImageOffset.x, webImageOffset.y);
  Send(new DragHostMsg_StartDragging(routing_id_,
                                     drop_data,
                                     mask,
                                     image.getSkBitmap(),
                                     imageOffset,
                                     possible_drag_event_info_));
}

bool RenderViewImpl::acceptsLoadDrops() {
  return renderer_preferences_.can_accept_load_drops;
}

void RenderViewImpl::focusNext() {
  Send(new ViewHostMsg_TakeFocus(routing_id_, false));
}

void RenderViewImpl::focusPrevious() {
  Send(new ViewHostMsg_TakeFocus(routing_id_, true));
}

void RenderViewImpl::focusedNodeChanged(const WebNode& node) {
  Send(new ViewHostMsg_FocusedNodeChanged(routing_id_, IsEditableNode(node)));

  FOR_EACH_OBSERVER(RenderViewObserver, observers_, FocusedNodeChanged(node));
}

void RenderViewImpl::numberOfWheelEventHandlersChanged(unsigned num_handlers) {
  Send(new ViewHostMsg_DidChangeNumWheelEvents(routing_id_, num_handlers));
}

void RenderViewImpl::didUpdateLayout() {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidUpdateLayout());

  // We don't always want to set up a timer, only if we've been put in that
  // mode by getting a |ViewMsg_EnablePreferredSizeChangedMode|
  // message.
  if (!send_preferred_size_changes_ || !webview())
    return;

  if (check_preferred_size_timer_.IsRunning())
    return;
  check_preferred_size_timer_.Start(FROM_HERE,
                                    TimeDelta::FromMilliseconds(0), this,
                                    &RenderViewImpl::CheckPreferredSize);
}

void RenderViewImpl::navigateBackForwardSoon(int offset) {
  Send(new ViewHostMsg_GoToEntryAtOffset(routing_id_, offset));
}

int RenderViewImpl::historyBackListCount() {
  return history_list_offset_ < 0 ? 0 : history_list_offset_;
}

int RenderViewImpl::historyForwardListCount() {
  return history_list_length_ - historyBackListCount() - 1;
}

void RenderViewImpl::postAccessibilityEvent(
    const WebAXObject& obj, blink::WebAXEvent event) {
  if (renderer_accessibility_) {
    renderer_accessibility_->HandleWebAccessibilityEvent(obj, event);
  }
}

void RenderViewImpl::didUpdateInspectorSetting(const WebString& key,
                                           const WebString& value) {
  Send(new ViewHostMsg_UpdateInspectorSetting(routing_id_,
                                              key.utf8(),
                                              value.utf8()));
}

// blink::WebWidgetClient ----------------------------------------------------

void RenderViewImpl::didFocus() {
  // TODO(jcivelli): when https://bugs.webkit.org/show_bug.cgi?id=33389 is fixed
  //                 we won't have to test for user gesture anymore and we can
  //                 move that code back to render_widget.cc
  if (WebUserGestureIndicator::isProcessingUserGesture() &&
      !RenderThreadImpl::current()->layout_test_mode()) {
    Send(new ViewHostMsg_Focus(routing_id_));
  }
}

void RenderViewImpl::didBlur() {
  // TODO(jcivelli): see TODO above in didFocus().
  if (WebUserGestureIndicator::isProcessingUserGesture() &&
      !RenderThreadImpl::current()->layout_test_mode()) {
    Send(new ViewHostMsg_Blur(routing_id_));
  }
}

// We are supposed to get a single call to Show for a newly created RenderView
// that was created via RenderViewImpl::CreateWebView.  So, we wait until this
// point to dispatch the ShowView message.
//
// This method provides us with the information about how to display the newly
// created RenderView (i.e., as a blocked popup or as a new tab).
//
void RenderViewImpl::show(WebNavigationPolicy policy) {
  if (did_show_) {
    // When supports_multiple_windows is disabled, popups are reusing
    // the same view. In some scenarios, this makes WebKit to call show() twice.
    if (webkit_preferences_.supports_multiple_windows)
      NOTREACHED() << "received extraneous Show call";
    return;
  }
  did_show_ = true;

  DCHECK(opener_id_ != MSG_ROUTING_NONE);

  // Force new windows to a popup if they were not opened with a user gesture.
  if (!opened_by_user_gesture_) {
    // We exempt background tabs for compat with older versions of Chrome.
    // TODO(darin): This seems bogus.  These should have a user gesture, so
    // we probably don't need this check.
    if (policy != blink::WebNavigationPolicyNewBackgroundTab)
      policy = blink::WebNavigationPolicyNewPopup;
  }

  // NOTE: initial_pos_ may still have its default values at this point, but
  // that's okay.  It'll be ignored if disposition is not NEW_POPUP, or the
  // browser process will impose a default position otherwise.
  Send(new ViewHostMsg_ShowView(opener_id_, routing_id_,
      NavigationPolicyToDisposition(policy), initial_pos_,
      opened_by_user_gesture_));
  SetPendingWindowRect(initial_pos_);
}

void RenderViewImpl::runModal() {
  DCHECK(did_show_) << "should already have shown the view";

  // Don't allow further dialogs if we are waiting to swap out, since the
  // PageGroupLoadDeferrer in our stack prevents it.
  if (suppress_dialogs_until_swap_out_)
    return;

  // We must keep WebKit's shared timer running in this case in order to allow
  // showModalDialog to function properly.
  //
  // TODO(darin): WebKit should really be smarter about suppressing events and
  // timers so that we do not need to manage the shared timer in such a heavy
  // handed manner.
  //
  if (RenderThreadImpl::current())  // Will be NULL during unit tests.
    RenderThreadImpl::current()->DoNotSuspendWebKitSharedTimer();

  SendAndRunNestedMessageLoop(new ViewHostMsg_RunModal(
      routing_id_, opener_id_));
}

bool RenderViewImpl::enterFullScreen() {
  Send(new ViewHostMsg_ToggleFullscreen(routing_id_, true));
  return true;
}

void RenderViewImpl::exitFullScreen() {
  Send(new ViewHostMsg_ToggleFullscreen(routing_id_, false));
}

bool RenderViewImpl::requestPointerLock() {
  return mouse_lock_dispatcher_->LockMouse(webwidget_mouse_lock_target_.get());
}

void RenderViewImpl::requestPointerUnlock() {
  mouse_lock_dispatcher_->UnlockMouse(webwidget_mouse_lock_target_.get());
}

bool RenderViewImpl::isPointerLocked() {
  return mouse_lock_dispatcher_->IsMouseLockedTo(
      webwidget_mouse_lock_target_.get());
}

void RenderViewImpl::didActivateCompositor(int input_handler_identifier) {
#if !defined(OS_MACOSX)  // many events are unhandled - http://crbug.com/138003
  InputHandlerManager* input_handler_manager =
      RenderThreadImpl::current()->input_handler_manager();
  if (input_handler_manager) {
     input_handler_manager->AddInputHandler(
        routing_id_,
        compositor_->GetInputHandler(),
        AsWeakPtr());
  }
#endif

  RenderWidget::didActivateCompositor(input_handler_identifier);
}

void RenderViewImpl::didHandleGestureEvent(
    const WebGestureEvent& event,
    bool event_cancelled) {
  RenderWidget::didHandleGestureEvent(event, event_cancelled);

  if (event.type != blink::WebGestureEvent::GestureTap)
    return;

  blink::WebTextInputType text_input_type =
      GetWebView()->textInputInfo().type;

  Send(new ViewHostMsg_FocusedNodeTouched(
      routing_id(), text_input_type != blink::WebTextInputTypeNone));
}

void RenderViewImpl::initializeLayerTreeView() {
  RenderWidget::initializeLayerTreeView();
  RenderWidgetCompositor* rwc = compositor();
  if (!rwc || !webview() || !webview()->devToolsAgent())
    return;
  webview()->devToolsAgent()->setLayerTreeId(rwc->GetLayerTreeId());
}

// blink::WebFrameClient -----------------------------------------------------

WebMediaPlayer* RenderViewImpl::createMediaPlayer(
    WebFrame* frame, const blink::WebURL& url, WebMediaPlayerClient* client) {
  NOTREACHED();
  return NULL;
}

blink::WebMediaPlayer* RenderViewImpl::CreateMediaPlayer(
    RenderFrame* render_frame,
    blink::WebFrame* frame,
    const blink::WebURL& url,
    blink::WebMediaPlayerClient* client) {
  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_, WillCreateMediaPlayer(frame, client));

  WebMediaPlayer* player = CreateWebMediaPlayerForMediaStream(frame, url,
                                                              client);
  if (player)
    return player;

#if defined(OS_ANDROID)
  return CreateAndroidWebMediaPlayer(frame, url, client);
#else
  scoped_refptr<media::AudioRendererSink> sink;
  if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableAudio)) {
    sink = RenderThreadImpl::current()->GetAudioRendererMixerManager()->
        CreateInput(routing_id_);
    DVLOG(1) << "Using AudioRendererMixerManager-provided sink: " << sink.get();
  }

  WebMediaPlayerParams params(
      RenderThreadImpl::current()->GetMediaThreadMessageLoopProxy(),
      base::Bind(&ContentRendererClient::DeferMediaLoad,
                 base::Unretained(GetContentClient()->renderer()),
                 static_cast<RenderFrame*>(render_frame)),
      sink,
      RenderThreadImpl::current()->GetGpuFactories(),
      new RenderMediaLog());
  return new WebMediaPlayerImpl(this, frame, client, AsWeakPtr(), params);
#endif  // defined(OS_ANDROID)
}

WebCookieJar* RenderViewImpl::cookieJar(WebFrame* frame) {
  return &cookie_jar_;
}

void RenderViewImpl::didAccessInitialDocument(WebFrame* frame) {
  // Notify the browser process that it is no longer safe to show the pending
  // URL of the main frame, since a URL spoof is now possible.
  if (!frame->parent() && page_id_ == -1)
    Send(new ViewHostMsg_DidAccessInitialDocument(routing_id_));
}

void RenderViewImpl::didDisownOpener(blink::WebFrame* frame) {
  // We only need to notify the browser if the active, top-level frame clears
  // its opener.  We can ignore cases where a swapped out frame clears its
  // opener after hearing about it from the browser, and the browser does not
  // (yet) care about subframe openers.
  if (is_swapped_out_ || frame->parent())
    return;

  // Notify WebContents and all its swapped out RenderViews.
  Send(new ViewHostMsg_DidDisownOpener(routing_id_));
}

void RenderViewImpl::frameDetached(WebFrame* frame) {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, FrameDetached(frame));
}

void RenderViewImpl::willClose(WebFrame* frame) {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, FrameWillClose(frame));
}

void RenderViewImpl::didMatchCSS(
    WebFrame* frame,
    const WebVector<WebString>& newly_matching_selectors,
    const WebVector<WebString>& stopped_matching_selectors) {
  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_,
      DidMatchCSS(frame, newly_matching_selectors, stopped_matching_selectors));
}

void RenderViewImpl::Repaint(const gfx::Size& size) {
  OnRepaint(size);
}

void RenderViewImpl::SetEditCommandForNextKeyEvent(const std::string& name,
                                                   const std::string& value) {
  EditCommands edit_commands;
  edit_commands.push_back(EditCommand(name, value));
  OnSetEditCommandsForNextKeyEvent(edit_commands);
}

void RenderViewImpl::ClearEditCommands() {
  edit_commands_.clear();
}

SSLStatus RenderViewImpl::GetSSLStatusOfFrame(blink::WebFrame* frame) const {
  std::string security_info;
  if (frame && frame->dataSource())
    security_info = frame->dataSource()->response().securityInfo();

  SSLStatus ssl_status;
  DeserializeSecurityInfo(security_info,
                          &ssl_status.cert_id,
                          &ssl_status.cert_status,
                          &ssl_status.security_bits,
                          &ssl_status.connection_status,
                          &ssl_status.signed_certificate_timestamp_ids);
  return ssl_status;
}

const std::string& RenderViewImpl::GetAcceptLanguages() const {
  return renderer_preferences_.accept_languages;
}

WebNavigationPolicy RenderViewImpl::decidePolicyForNavigation(
    WebFrame* frame, WebDataSource::ExtraData* extraData,
    const WebURLRequest& request, WebNavigationType type,
    WebNavigationPolicy default_policy, bool is_redirect) {
#ifdef OS_ANDROID
  // The handlenavigation API is deprecated and will be removed once
  // crbug.com/325351 is resolved.
  if (request.url() != GURL(kSwappedOutURL) &&
      GetContentClient()->renderer()->HandleNavigation(
          this,
          static_cast<DocumentState*>(extraData),
          opener_id_,
          frame,
          request,
          type,
          default_policy,
          is_redirect)) {
    return blink::WebNavigationPolicyIgnore;
  }
#endif

  Referrer referrer(GetReferrerFromRequest(frame, request));

  if (is_swapped_out_) {
    if (request.url() != GURL(kSwappedOutURL)) {
      // Targeted links may try to navigate a swapped out frame.  Allow the
      // browser process to navigate the tab instead.  Note that it is also
      // possible for non-targeted navigations (from this view) to arrive
      // here just after we are swapped out.  It's ok to send them to the
      // browser, as long as they're for the top level frame.
      // TODO(creis): Ensure this supports targeted form submissions when
      // fixing http://crbug.com/101395.
      if (frame->parent() == NULL) {
        OpenURL(frame, request.url(), referrer, default_policy);
        return blink::WebNavigationPolicyIgnore;  // Suppress the load here.
      }

      // We should otherwise ignore in-process iframe navigations, if they
      // arrive just after we are swapped out.
      return blink::WebNavigationPolicyIgnore;
    }

    // Allow kSwappedOutURL to complete.
    return default_policy;
  }

  // Webkit is asking whether to navigate to a new URL.
  // This is fine normally, except if we're showing UI from one security
  // context and they're trying to navigate to a different context.
  const GURL& url = request.url();

  // A content initiated navigation may have originated from a link-click,
  // script, drag-n-drop operation, etc.
  bool is_content_initiated = static_cast<DocumentState*>(extraData)->
          navigation_state()->is_content_initiated();

  // Experimental:
  // If --enable-strict-site-isolation or --site-per-process is enabled, send
  // all top-level navigations to the browser to let it swap processes when
  // crossing site boundaries.  This is currently expected to break some script
  // calls and navigations, such as form submissions.
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
  bool force_swap_due_to_flag =
      command_line.HasSwitch(switches::kEnableStrictSiteIsolation) ||
      command_line.HasSwitch(switches::kSitePerProcess);
  if (force_swap_due_to_flag &&
      !frame->parent() && (is_content_initiated || is_redirect)) {
    WebString origin_str = frame->document().securityOrigin().toString();
    GURL frame_url(origin_str.utf8().data());
    // TODO(cevans): revisit whether this site check is still necessary once
    // crbug.com/101395 is fixed.
    bool same_domain_or_host =
        net::registry_controlled_domains::SameDomainOrHost(
            frame_url,
            url,
            net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
    if (!same_domain_or_host || frame_url.scheme() != url.scheme()) {
      OpenURL(frame, url, referrer, default_policy);
      return blink::WebNavigationPolicyIgnore;
    }
  }

  // If the browser is interested, then give it a chance to look at the request.
  if (is_content_initiated) {
    bool is_form_post = ((type == blink::WebNavigationTypeFormSubmitted) ||
                         (type == blink::WebNavigationTypeFormResubmitted)) &&
                        EqualsASCII(request.httpMethod(), "POST");
    bool browser_handles_request =
        renderer_preferences_.browser_handles_non_local_top_level_requests &&
        IsNonLocalTopLevelNavigation(url, frame, type, is_form_post);
    if (!browser_handles_request) {
      browser_handles_request = IsTopLevelNavigation(frame) &&
          (renderer_preferences_.browser_handles_all_top_level_requests ||
           (renderer_preferences_.browser_handles_all_top_level_link_clicks &&
            type == blink::WebNavigationTypeLinkClicked));
    }

    if (browser_handles_request) {
      // Reset these counters as the RenderView could be reused for the next
      // navigation.
      page_id_ = -1;
      last_page_id_sent_to_browser_ = -1;
      OpenURL(frame, url, referrer, default_policy);
      return blink::WebNavigationPolicyIgnore;  // Suppress the load here.
    }
  }

  // Use the frame's original request's URL rather than the document's URL for
  // subsequent checks.  For a popup, the document's URL may become the opener
  // window's URL if the opener has called document.write().
  // See http://crbug.com/93517.
  GURL old_url(frame->dataSource()->request().url());

  // Detect when we're crossing a permission-based boundary (e.g. into or out of
  // an extension or app origin, leaving a WebUI page, etc). We only care about
  // top-level navigations (not iframes). But we sometimes navigate to
  // about:blank to clear a tab, and we want to still allow that.
  //
  // Note: this is known to break POST submissions when crossing process
  // boundaries until http://crbug.com/101395 is fixed.  This is better for
  // security than loading a WebUI, extension or app page in the wrong process.
  // POST requests don't work because this mechanism does not preserve form
  // POST data. We will need to send the request's httpBody data up to the
  // browser process, and issue a special POST navigation in WebKit (via
  // FrameLoader::loadFrameRequest). See ResourceDispatcher and WebURLLoaderImpl
  // for examples of how to send the httpBody data.
  if (!frame->parent() && is_content_initiated &&
      !url.SchemeIs(chrome::kAboutScheme)) {
    bool send_referrer = false;

    // All navigations to or from WebUI URLs or within WebUI-enabled
    // RenderProcesses must be handled by the browser process so that the
    // correct bindings and data sources can be registered.
    // Similarly, navigations to view-source URLs or within ViewSource mode
    // must be handled by the browser process (except for reloads - those are
    // safe to leave within the renderer).
    // Lastly, access to file:// URLs from non-file:// URL pages must be
    // handled by the browser so that ordinary renderer processes don't get
    // blessed with file permissions.
    int cumulative_bindings = RenderProcess::current()->GetEnabledBindings();
    bool is_initial_navigation = page_id_ == -1;
    bool should_fork = HasWebUIScheme(url) || HasWebUIScheme(old_url) ||
        (cumulative_bindings & BINDINGS_POLICY_WEB_UI) ||
        url.SchemeIs(kViewSourceScheme) ||
        (frame->isViewSourceModeEnabled() &&
            type != blink::WebNavigationTypeReload);

    if (!should_fork && url.SchemeIs(chrome::kFileScheme)) {
      // Fork non-file to file opens.  Check the opener URL if this is the
      // initial navigation in a newly opened window.
      GURL source_url(old_url);
      if (is_initial_navigation && source_url.is_empty() && frame->opener())
        source_url = frame->opener()->top()->document().url();
      DCHECK(!source_url.is_empty());
      should_fork = !source_url.SchemeIs(chrome::kFileScheme);
    }

    if (!should_fork) {
      // Give the embedder a chance.
      should_fork = GetContentClient()->renderer()->ShouldFork(
          frame, url, request.httpMethod().utf8(), is_initial_navigation,
          is_redirect, &send_referrer);
    }

    if (should_fork) {
      OpenURL(
          frame, url, send_referrer ? referrer : Referrer(), default_policy);
      return blink::WebNavigationPolicyIgnore;  // Suppress the load here.
    }
  }

  // Detect when a page is "forking" a new tab that can be safely rendered in
  // its own process.  This is done by sites like Gmail that try to open links
  // in new windows without script connections back to the original page.  We
  // treat such cases as browser navigations (in which we will create a new
  // renderer for a cross-site navigation), rather than WebKit navigations.
  //
  // We use the following heuristic to decide whether to fork a new page in its
  // own process:
  // The parent page must open a new tab to about:blank, set the new tab's
  // window.opener to null, and then redirect the tab to a cross-site URL using
  // JavaScript.
  //
  // TODO(creis): Deprecate this logic once we can rely on rel=noreferrer
  // (see below).
  bool is_fork =
      // Must start from a tab showing about:blank, which is later redirected.
      old_url == GURL(kAboutBlankURL) &&
      // Must be the first real navigation of the tab.
      historyBackListCount() < 1 &&
      historyForwardListCount() < 1 &&
      // The parent page must have set the child's window.opener to null before
      // redirecting to the desired URL.
      frame->opener() == NULL &&
      // Must be a top-level frame.
      frame->parent() == NULL &&
      // Must not have issued the request from this page.
      is_content_initiated &&
      // Must be targeted at the current tab.
      default_policy == blink::WebNavigationPolicyCurrentTab &&
      // Must be a JavaScript navigation, which appears as "other".
      type == blink::WebNavigationTypeOther;

  if (is_fork) {
    // Open the URL via the browser, not via WebKit.
    OpenURL(frame, url, Referrer(), default_policy);
    return blink::WebNavigationPolicyIgnore;
  }

  return default_policy;
}

WebNavigationPolicy RenderViewImpl::decidePolicyForNavigation(
    WebFrame* frame, const WebURLRequest& request, WebNavigationType type,
    WebNavigationPolicy default_policy, bool is_redirect) {
  return decidePolicyForNavigation(frame,
                                   frame->provisionalDataSource()->extraData(),
                                   request, type, default_policy, is_redirect);
}

void RenderViewImpl::willSendSubmitEvent(blink::WebFrame* frame,
    const blink::WebFormElement& form) {
  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_, WillSendSubmitEvent(frame, form));
}

void RenderViewImpl::willSubmitForm(WebFrame* frame,
                                    const WebFormElement& form) {
  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_, WillSubmitForm(frame, form));
}

void RenderViewImpl::didCreateDataSource(WebFrame* frame, WebDataSource* ds) {
  bool content_initiated = !pending_navigation_params_.get();

  // Make sure any previous redirect URLs end up in our new data source.
  if (pending_navigation_params_.get()) {
    for (std::vector<GURL>::const_iterator i =
             pending_navigation_params_->redirects.begin();
         i != pending_navigation_params_->redirects.end(); ++i) {
      ds->appendRedirect(*i);
    }
  }

  DocumentState* document_state = DocumentState::FromDataSource(ds);
  if (!document_state) {
    document_state = new DocumentState;
    ds->setExtraData(document_state);
    if (!content_initiated)
      PopulateDocumentStateFromPending(document_state);
  }

  // Carry over the user agent override flag, if it exists.
  if (content_initiated && webview() && webview()->mainFrame() &&
      webview()->mainFrame()->dataSource()) {
    DocumentState* old_document_state =
        DocumentState::FromDataSource(webview()->mainFrame()->dataSource());
    if (old_document_state) {
      InternalDocumentStateData* internal_data =
          InternalDocumentStateData::FromDocumentState(document_state);
      InternalDocumentStateData* old_internal_data =
          InternalDocumentStateData::FromDocumentState(old_document_state);
      internal_data->set_is_overriding_user_agent(
          old_internal_data->is_overriding_user_agent());
    }
  }

  // The rest of RenderView assumes that a WebDataSource will always have a
  // non-null NavigationState.
  if (content_initiated) {
    document_state->set_navigation_state(
        NavigationState::CreateContentInitiated());
  } else {
    document_state->set_navigation_state(CreateNavigationStateFromPending());
    pending_navigation_params_.reset();
  }

  // DocumentState::referred_by_prefetcher_ is true if we are
  // navigating from a page that used prefetching using a link on that
  // page.  We are early enough in the request process here that we
  // can still see the DocumentState of the previous page and set
  // this value appropriately.
  // TODO(gavinp): catch the important case of navigation in a new
  // renderer process.
  if (webview()) {
    if (WebFrame* old_frame = webview()->mainFrame()) {
      const WebURLRequest& original_request = ds->originalRequest();
      const GURL referrer(
          original_request.httpHeaderField(WebString::fromUTF8("Referer")));
      if (!referrer.is_empty() &&
          DocumentState::FromDataSource(
              old_frame->dataSource())->was_prefetcher()) {
        for (; old_frame; old_frame = old_frame->traverseNext(false)) {
          WebDataSource* old_frame_ds = old_frame->dataSource();
          if (old_frame_ds && referrer == GURL(old_frame_ds->request().url())) {
            document_state->set_was_referred_by_prefetcher(true);
            break;
          }
        }
      }
    }
  }

  if (content_initiated) {
    const WebURLRequest& request = ds->request();
    switch (request.cachePolicy()) {
      case WebURLRequest::UseProtocolCachePolicy:  // normal load.
        document_state->set_load_type(DocumentState::LINK_LOAD_NORMAL);
        break;
      case WebURLRequest::ReloadIgnoringCacheData:  // reload.
        document_state->set_load_type(DocumentState::LINK_LOAD_RELOAD);
        break;
      case WebURLRequest::ReturnCacheDataElseLoad:  // allow stale data.
        document_state->set_load_type(
            DocumentState::LINK_LOAD_CACHE_STALE_OK);
        break;
      case WebURLRequest::ReturnCacheDataDontLoad:  // Don't re-post.
        document_state->set_load_type(DocumentState::LINK_LOAD_CACHE_ONLY);
        break;
    }
  }

  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_, DidCreateDataSource(frame, ds));
}

void RenderViewImpl::PopulateDocumentStateFromPending(
    DocumentState* document_state) {
  const ViewMsg_Navigate_Params& params = *pending_navigation_params_.get();
  document_state->set_request_time(params.request_time);

  InternalDocumentStateData* internal_data =
      InternalDocumentStateData::FromDocumentState(document_state);

  if (!params.url.SchemeIs(kJavaScriptScheme) &&
      params.navigation_type == ViewMsg_Navigate_Type::RESTORE) {
    // We're doing a load of a page that was restored from the last session. By
    // default this prefers the cache over loading (LOAD_PREFERRING_CACHE) which
    // can result in stale data for pages that are set to expire. We explicitly
    // override that by setting the policy here so that as necessary we load
    // from the network.
    internal_data->set_cache_policy_override(
        WebURLRequest::UseProtocolCachePolicy);
  }

  if (IsReload(params))
    document_state->set_load_type(DocumentState::RELOAD);
  else if (params.page_state.IsValid())
    document_state->set_load_type(DocumentState::HISTORY_LOAD);
  else
    document_state->set_load_type(DocumentState::NORMAL_LOAD);

  internal_data->set_referrer_policy(params.referrer.policy);
  internal_data->set_is_overriding_user_agent(params.is_overriding_user_agent);
  internal_data->set_must_reset_scroll_and_scale_state(
      params.navigation_type ==
          ViewMsg_Navigate_Type::RELOAD_ORIGINAL_REQUEST_URL);
  document_state->set_can_load_local_resources(params.can_load_local_resources);
}

NavigationState* RenderViewImpl::CreateNavigationStateFromPending() {
  const ViewMsg_Navigate_Params& params = *pending_navigation_params_.get();
  NavigationState* navigation_state = NULL;

  // A navigation resulting from loading a javascript URL should not be treated
  // as a browser initiated event.  Instead, we want it to look as if the page
  // initiated any load resulting from JS execution.
  if (!params.url.SchemeIs(kJavaScriptScheme)) {
    navigation_state = NavigationState::CreateBrowserInitiated(
        params.page_id,
        params.pending_history_list_offset,
        params.should_clear_history_list,
        params.transition);
    navigation_state->set_should_replace_current_entry(
        params.should_replace_current_entry);
    navigation_state->set_transferred_request_child_id(
        params.transferred_request_child_id);
    navigation_state->set_transferred_request_request_id(
        params.transferred_request_request_id);
    navigation_state->set_allow_download(params.allow_download);
    navigation_state->set_extra_headers(params.extra_headers);
  } else {
    navigation_state = NavigationState::CreateContentInitiated();
  }
  return navigation_state;
}

void RenderViewImpl::ProcessViewLayoutFlags(const CommandLine& command_line) {
  bool enable_viewport =
      command_line.HasSwitch(switches::kEnableViewport) ||
      command_line.HasSwitch(switches::kEnableViewportMeta);

  // If viewport tag is enabled, then the WebKit side will take care
  // of setting the fixed layout size and page scale limits.
  if (enable_viewport)
    return;

  // When navigating to a new page, reset the page scale factor to be 1.0.
  webview()->setInitialPageScaleOverride(1.f);

  float maxPageScaleFactor =
      command_line.HasSwitch(switches::kEnablePinch) ? 4.f : 1.f ;
  webview()->setPageScaleFactorLimits(1, maxPageScaleFactor);
}

// TODO(nasko): Remove this method once WebTestProxy in Blink is fixed.
void RenderViewImpl::didStartProvisionalLoad(WebFrame* frame) {
}

void RenderViewImpl::didReceiveServerRedirectForProvisionalLoad(
    WebFrame* frame) {
  if (frame->parent())
    return;
  // Received a redirect on the main frame.
  WebDataSource* data_source = frame->provisionalDataSource();
  if (!data_source) {
    // Should only be invoked when we have a data source.
    NOTREACHED();
    return;
  }
  std::vector<GURL> redirects;
  GetRedirectChain(data_source, &redirects);
  if (redirects.size() >= 2) {
    Send(new ViewHostMsg_DidRedirectProvisionalLoad(routing_id_, page_id_,
        redirects[redirects.size() - 2], redirects.back()));
  }
}

void RenderViewImpl::didFailProvisionalLoad(WebFrame* frame,
                                            const WebURLError& error) {
  // Notify the browser that we failed a provisional load with an error.
  //
  // Note: It is important this notification occur before DidStopLoading so the
  //       SSL manager can react to the provisional load failure before being
  //       notified the load stopped.
  //
  WebDataSource* ds = frame->provisionalDataSource();
  DCHECK(ds);

  const WebURLRequest& failed_request = ds->request();

  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_, DidFailProvisionalLoad(frame, error));

  bool show_repost_interstitial =
      (error.reason == net::ERR_CACHE_MISS &&
       EqualsASCII(failed_request.httpMethod(), "POST"));

  ViewHostMsg_DidFailProvisionalLoadWithError_Params params;
  params.frame_id = frame->identifier();
  params.frame_unique_name = frame->uniqueName();
  params.is_main_frame = !frame->parent();
  params.error_code = error.reason;
  GetContentClient()->renderer()->GetNavigationErrorStrings(
      frame,
      failed_request,
      error,
      renderer_preferences_.accept_languages,
      NULL,
      &params.error_description);
  params.url = error.unreachableURL;
  params.showing_repost_interstitial = show_repost_interstitial;
  Send(new ViewHostMsg_DidFailProvisionalLoadWithError(
      routing_id_, params));

  // Don't display an error page if this is simply a cancelled load.  Aside
  // from being dumb, WebCore doesn't expect it and it will cause a crash.
  if (error.reason == net::ERR_ABORTED)
    return;

  // Don't display "client blocked" error page if browser has asked us not to.
  if (error.reason == net::ERR_BLOCKED_BY_CLIENT &&
      renderer_preferences_.disable_client_blocked_error_page) {
    return;
  }

  // Allow the embedder to suppress an error page.
  if (GetContentClient()->renderer()->ShouldSuppressErrorPage(
          error.unreachableURL)) {
    return;
  }

  if (RenderThreadImpl::current() &&
      RenderThreadImpl::current()->layout_test_mode()) {
    return;
  }

  // Make sure we never show errors in view source mode.
  frame->enableViewSourceMode(false);

  DocumentState* document_state = DocumentState::FromDataSource(ds);
  NavigationState* navigation_state = document_state->navigation_state();

  // If this is a failed back/forward/reload navigation, then we need to do a
  // 'replace' load.  This is necessary to avoid messing up session history.
  // Otherwise, we do a normal load, which simulates a 'go' navigation as far
  // as session history is concerned.
  //
  // AUTO_SUBFRAME loads should always be treated as loads that do not advance
  // the page id.
  //
  // TODO(davidben): This should also take the failed navigation's replacement
  // state into account, if a location.replace() failed.
  bool replace =
      navigation_state->pending_page_id() != -1 ||
      PageTransitionCoreTypeIs(navigation_state->transition_type(),
                               PAGE_TRANSITION_AUTO_SUBFRAME);

  // If we failed on a browser initiated request, then make sure that our error
  // page load is regarded as the same browser initiated request.
  if (!navigation_state->is_content_initiated()) {
    pending_navigation_params_.reset(new ViewMsg_Navigate_Params);
    pending_navigation_params_->page_id =
        navigation_state->pending_page_id();
    pending_navigation_params_->pending_history_list_offset =
        navigation_state->pending_history_list_offset();
    pending_navigation_params_->should_clear_history_list =
        navigation_state->history_list_was_cleared();
    pending_navigation_params_->transition =
        navigation_state->transition_type();
    pending_navigation_params_->request_time =
        document_state->request_time();
    pending_navigation_params_->should_replace_current_entry = replace;
  }

  // Provide the user with a more helpful error page?
  if (MaybeLoadAlternateErrorPage(frame, error, replace))
    return;

  // Fallback to a local error page.
  LoadNavigationErrorPage(frame, failed_request, error, std::string(), replace);
}

void RenderViewImpl::didCommitProvisionalLoad(WebFrame* frame,
                                              bool is_new_navigation) {
  DocumentState* document_state =
      DocumentState::FromDataSource(frame->dataSource());
  NavigationState* navigation_state = document_state->navigation_state();
  InternalDocumentStateData* internal_data =
      InternalDocumentStateData::FromDocumentState(document_state);

  if (document_state->commit_load_time().is_null())
    document_state->set_commit_load_time(Time::Now());

  if (internal_data->must_reset_scroll_and_scale_state()) {
    webview()->resetScrollAndScaleState();
    internal_data->set_must_reset_scroll_and_scale_state(false);
  }
  internal_data->set_use_error_page(false);

  if (is_new_navigation) {
    // When we perform a new navigation, we need to update the last committed
    // session history entry with state for the page we are leaving.
    UpdateSessionHistory(frame);

    // We bump our Page ID to correspond with the new session history entry.
    page_id_ = next_page_id_++;

    // Don't update history_page_ids_ (etc) for kSwappedOutURL, since
    // we don't want to forget the entry that was there, and since we will
    // never come back to kSwappedOutURL.  Note that we have to call
    // UpdateSessionHistory and update page_id_ even in this case, so that
    // the current entry gets a state update and so that we don't send a
    // state update to the wrong entry when we swap back in.
    if (GetLoadingUrl(frame) != GURL(kSwappedOutURL)) {
      // Advance our offset in session history, applying the length limit.
      // There is now no forward history.
      history_list_offset_++;
      if (history_list_offset_ >= kMaxSessionHistoryEntries)
        history_list_offset_ = kMaxSessionHistoryEntries - 1;
      history_list_length_ = history_list_offset_ + 1;
      history_page_ids_.resize(history_list_length_, -1);
      history_page_ids_[history_list_offset_] = page_id_;
    }
  } else {
    // Inspect the navigation_state on this frame to see if the navigation
    // corresponds to a session history navigation...  Note: |frame| may or
    // may not be the toplevel frame, but for the case of capturing session
    // history, the first committed frame suffices.  We keep track of whether
    // we've seen this commit before so that only capture session history once
    // per navigation.
    //
    // Note that we need to check if the page ID changed. In the case of a
    // reload, the page ID doesn't change, and UpdateSessionHistory gets the
    // previous URL and the current page ID, which would be wrong.
    if (navigation_state->pending_page_id() != -1 &&
        navigation_state->pending_page_id() != page_id_ &&
        !navigation_state->request_committed()) {
      // This is a successful session history navigation!
      UpdateSessionHistory(frame);
      page_id_ = navigation_state->pending_page_id();

      history_list_offset_ = navigation_state->pending_history_list_offset();

      // If the history list is valid, our list of page IDs should be correct.
      DCHECK(history_list_length_ <= 0 ||
             history_list_offset_ < 0 ||
             history_list_offset_ >= history_list_length_ ||
             history_page_ids_[history_list_offset_] == page_id_);
    }
  }

  FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                    DidCommitProvisionalLoad(frame, is_new_navigation));

  // Remember that we've already processed this request, so we don't update
  // the session history again.  We do this regardless of whether this is
  // a session history navigation, because if we attempted a session history
  // navigation without valid HistoryItem state, WebCore will think it is a
  // new navigation.
  navigation_state->set_request_committed(true);

  UpdateURL(frame);

  // Check whether we have new encoding name.
  UpdateEncoding(frame, frame->view()->pageEncoding().utf8());

  if (!frame->parent()) {  // Only for top frames.
    RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
    if (render_thread_impl) {  // Can be NULL in tests.
      render_thread_impl->histogram_customizer()->
          RenderViewNavigatedToHost(GURL(GetLoadingUrl(frame)).host(),
                                    g_view_map.Get().size());
    }
  }
}

void RenderViewImpl::didClearWindowObject(WebFrame* frame) {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                    DidClearWindowObject(frame));

  if (enabled_bindings_ & BINDINGS_POLICY_DOM_AUTOMATION) {
    if (!dom_automation_controller_)
      dom_automation_controller_.reset(new DomAutomationController());
    dom_automation_controller_->set_message_sender(
        static_cast<RenderView*>(this));
    dom_automation_controller_->set_routing_id(routing_id());
    dom_automation_controller_->BindToJavascript(frame,
                                                 "domAutomationController");
  }

   if (enabled_bindings_ & BINDINGS_POLICY_STATS_COLLECTION)
     StatsCollectionController::Install(frame);
}

void RenderViewImpl::didCreateDocumentElement(WebFrame* frame) {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                    DidCreateDocumentElement(frame));
}

void RenderViewImpl::didReceiveTitle(WebFrame* frame, const WebString& title,
                                     WebTextDirection direction) {
  UpdateTitle(frame, title, direction);

  // Also check whether we have new encoding name.
  UpdateEncoding(frame, frame->view()->pageEncoding().utf8());
}

void RenderViewImpl::didChangeIcon(WebFrame* frame,
                                   WebIconURL::Type icon_type) {
  if (frame->parent())
    return;

  if (!TouchEnabled() && icon_type != WebIconURL::TypeFavicon)
    return;

  WebVector<WebIconURL> icon_urls = frame->iconURLs(icon_type);
  std::vector<FaviconURL> urls;
  for (size_t i = 0; i < icon_urls.size(); i++) {
    urls.push_back(FaviconURL(icon_urls[i].iconURL(),
                              ToFaviconType(icon_urls[i].iconType())));
  }
  SendUpdateFaviconURL(urls);
}

void RenderViewImpl::didFinishDocumentLoad(WebFrame* frame) {
  WebDataSource* ds = frame->dataSource();
  DocumentState* document_state = DocumentState::FromDataSource(ds);
  document_state->set_finish_document_load_time(Time::Now());

  Send(new ViewHostMsg_DocumentLoadedInFrame(routing_id_, frame->identifier()));

  FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                    DidFinishDocumentLoad(frame));

  // Check whether we have new encoding name.
  UpdateEncoding(frame, frame->view()->pageEncoding().utf8());
}

void RenderViewImpl::didHandleOnloadEvents(WebFrame* frame) {
  if (webview()->mainFrame() == frame) {
    Send(new ViewHostMsg_DocumentOnLoadCompletedInMainFrame(routing_id_,
                                                            page_id_));
  }
}

void RenderViewImpl::didFailLoad(WebFrame* frame, const WebURLError& error) {
  WebDataSource* ds = frame->dataSource();
  DCHECK(ds);


  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidFailLoad(frame, error));

  const WebURLRequest& failed_request = ds->request();
  base::string16 error_description;
  GetContentClient()->renderer()->GetNavigationErrorStrings(
      frame,
      failed_request,
      error,
      renderer_preferences_.accept_languages,
      NULL,
      &error_description);
  Send(new ViewHostMsg_DidFailLoadWithError(routing_id_,
                                            frame->identifier(),
                                            failed_request.url(),
                                            !frame->parent(),
                                            error.reason,
                                            error_description));
}

void RenderViewImpl::didFinishLoad(WebFrame* frame) {
  WebDataSource* ds = frame->dataSource();
  DocumentState* document_state = DocumentState::FromDataSource(ds);
  if (document_state->finish_load_time().is_null()) {
    if (!frame->parent()) {
      TRACE_EVENT_INSTANT0("WebCore", "LoadFinished",
                           TRACE_EVENT_SCOPE_PROCESS);
    }
    document_state->set_finish_load_time(Time::Now());
  }

  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidFinishLoad(frame));

  Send(new ViewHostMsg_DidFinishLoad(routing_id_,
                                     frame->identifier(),
                                     ds->request().url(),
                                     !frame->parent()));
}

void RenderViewImpl::didNavigateWithinPage(
    WebFrame* frame, bool is_new_navigation) {
  // If this was a reference fragment navigation that we initiated, then we
  // could end up having a non-null pending navigation params.  We just need to
  // update the ExtraData on the datasource so that others who read the
  // ExtraData will get the new NavigationState.  Similarly, if we did not
  // initiate this navigation, then we need to take care to reset any pre-
  // existing navigation state to a content-initiated navigation state.
  // DidCreateDataSource conveniently takes care of this for us.
  didCreateDataSource(frame, frame->dataSource());

  DocumentState* document_state =
      DocumentState::FromDataSource(frame->dataSource());
  NavigationState* new_state = document_state->navigation_state();
  new_state->set_was_within_same_page(true);

  didCommitProvisionalLoad(frame, is_new_navigation);
}

void RenderViewImpl::didUpdateCurrentHistoryItem(WebFrame* frame) {
  StartNavStateSyncTimerIfNecessary();
}

void RenderViewImpl::willSendRequest(WebFrame* frame,
                                     unsigned identifier,
                                     WebURLRequest& request,
                                     const WebURLResponse& redirect_response) {
  NOTREACHED();
}

void RenderViewImpl::didReceiveResponse(
    WebFrame* frame, unsigned identifier, const WebURLResponse& response) {
  NOTREACHED();
}

void RenderViewImpl::didFinishResourceLoad(
    WebFrame* frame, unsigned identifier) {
  InternalDocumentStateData* internal_data =
      InternalDocumentStateData::FromDataSource(frame->dataSource());
  if (!internal_data->use_error_page())
    return;

  // Do not show error page when DevTools is attached.
  if (devtools_agent_->IsAttached())
    return;

  // Display error page, if appropriate.
  int http_status_code = internal_data->http_status_code();
  if (http_status_code == 404) {
    // On 404s, try a remote search page as a fallback.
    const GURL& document_url = frame->document().url();

    const GURL& error_page_url =
        GetAlternateErrorPageURL(document_url, HTTP_404);
    if (error_page_url.is_valid()) {
      WebURLError original_error;
      original_error.domain = "http";
      original_error.reason = 404;
      original_error.unreachableURL = document_url;

      internal_data->set_alt_error_page_fetcher(
          new AltErrorPageResourceFetcher(
              error_page_url, frame, frame->dataSource()->request(),
              original_error,
              base::Bind(&RenderViewImpl::AltErrorPageFinished,
                         base::Unretained(this))));
      return;
    }
  }

  std::string error_domain;
  if (GetContentClient()->renderer()->HasErrorPage(
          http_status_code, &error_domain)) {
    WebURLError error;
    error.unreachableURL = frame->document().url();
    error.domain = WebString::fromUTF8(error_domain);
    error.reason = http_status_code;

    LoadNavigationErrorPage(
        frame, frame->dataSource()->request(), error, std::string(), true);
  }
}

void RenderViewImpl::didLoadResourceFromMemoryCache(
    WebFrame* frame, const WebURLRequest& request,
    const WebURLResponse& response) {
  NOTREACHED();
}

void RenderViewImpl::didDisplayInsecureContent(WebFrame* frame) {
  NOTREACHED();
}

void RenderViewImpl::didRunInsecureContent(
    WebFrame* frame, const WebSecurityOrigin& origin, const WebURL& target) {
  NOTREACHED();
}

void RenderViewImpl::didExhaustMemoryAvailableForScript(WebFrame* frame) {
  NOTREACHED();
}

void RenderViewImpl::didCreateScriptContext(WebFrame* frame,
                                            v8::Handle<v8::Context> context,
                                            int extension_group,
                                            int world_id) {
  NOTREACHED();
}

void RenderViewImpl::willReleaseScriptContext(WebFrame* frame,
                                              v8::Handle<v8::Context> context,
                                              int world_id) {
  NOTREACHED();
}

void RenderViewImpl::CheckPreferredSize() {
  // We don't always want to send the change messages over IPC, only if we've
  // been put in that mode by getting a |ViewMsg_EnablePreferredSizeChangedMode|
  // message.
  if (!send_preferred_size_changes_ || !webview())
    return;

  gfx::Size size = webview()->contentsPreferredMinimumSize();

  // In the presence of zoom, these sizes are still reported as if unzoomed,
  // so we need to adjust.
  double zoom_factor = ZoomLevelToZoomFactor(webview()->zoomLevel());
  size.set_width(static_cast<int>(size.width() * zoom_factor));
  size.set_height(static_cast<int>(size.height() * zoom_factor));

  if (size == preferred_size_)
    return;

  preferred_size_ = size;
  Send(new ViewHostMsg_DidContentsPreferredSizeChange(routing_id_,
                                                      preferred_size_));
}

BrowserPluginManager* RenderViewImpl::GetBrowserPluginManager() {
  if (!browser_plugin_manager_.get())
    browser_plugin_manager_ = BrowserPluginManager::Create(this);
  return browser_plugin_manager_.get();
}

bool RenderViewImpl::InitializeMediaStreamClient() {
  if (media_stream_client_)
    return true;

  if (!RenderThreadImpl::current())  // Will be NULL during unit tests.
    return false;

#if defined(OS_ANDROID)
  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableWebRTC))
    return false;
#endif

#if defined(ENABLE_WEBRTC)
  if (!media_stream_dispatcher_)
    media_stream_dispatcher_ = new MediaStreamDispatcher(this);

  MediaStreamImpl* media_stream_impl = new MediaStreamImpl(
      this,
      media_stream_dispatcher_,
      RenderThreadImpl::current()->GetMediaStreamDependencyFactory());
  media_stream_client_ = media_stream_impl;
  web_user_media_client_ = media_stream_impl;
  return true;
#else
  return false;
#endif
}

void RenderViewImpl::didChangeContentsSize(WebFrame* frame,
                                           const WebSize& size) {
  if (webview()->mainFrame() != frame)
    return;
  WebView* frameView = frame->view();
  if (!frameView)
    return;

  bool has_horizontal_scrollbar = frame->hasHorizontalScrollbar();
  bool has_vertical_scrollbar = frame->hasVerticalScrollbar();

  if (has_horizontal_scrollbar != cached_has_main_frame_horizontal_scrollbar_ ||
      has_vertical_scrollbar != cached_has_main_frame_vertical_scrollbar_) {
    Send(new ViewHostMsg_DidChangeScrollbarsForMainFrame(
          routing_id_, has_horizontal_scrollbar, has_vertical_scrollbar));

    cached_has_main_frame_horizontal_scrollbar_ = has_horizontal_scrollbar;
    cached_has_main_frame_vertical_scrollbar_ = has_vertical_scrollbar;
  }
}

void RenderViewImpl::UpdateScrollState(WebFrame* frame) {
  WebSize offset = frame->scrollOffset();
  WebSize minimum_offset = frame->minimumScrollOffset();
  WebSize maximum_offset = frame->maximumScrollOffset();

  bool is_pinned_to_left = offset.width <= minimum_offset.width;
  bool is_pinned_to_right = offset.width >= maximum_offset.width;

  if (is_pinned_to_left != cached_is_main_frame_pinned_to_left_ ||
      is_pinned_to_right != cached_is_main_frame_pinned_to_right_) {
    Send(new ViewHostMsg_DidChangeScrollOffsetPinningForMainFrame(
          routing_id_, is_pinned_to_left, is_pinned_to_right));

    cached_is_main_frame_pinned_to_left_ = is_pinned_to_left;
    cached_is_main_frame_pinned_to_right_ = is_pinned_to_right;
  }

  Send(new ViewHostMsg_DidChangeScrollOffset(routing_id_));
}

void RenderViewImpl::didChangeScrollOffset(WebFrame* frame) {
  StartNavStateSyncTimerIfNecessary();

  if (webview()->mainFrame() == frame)
    UpdateScrollState(frame);

  FOR_EACH_OBSERVER(
      RenderViewObserver, observers_, DidChangeScrollOffset(frame));
}

void RenderViewImpl::willInsertBody(blink::WebFrame* frame) {
  NOTREACHED();
}

void RenderViewImpl::didFirstVisuallyNonEmptyLayout(WebFrame* frame) {
  if (frame != webview()->mainFrame())
    return;

  InternalDocumentStateData* data =
      InternalDocumentStateData::FromDataSource(frame->dataSource());
  data->set_did_first_visually_non_empty_layout(true);

#if defined(OS_ANDROID)
  // Update body background color if necessary.
  SkColor bg_color = webwidget_->backgroundColor();

  // If not initialized, default to white. Note that 0 is different from black
  // as black still has alpha 0xFF.
  if (!bg_color)
    bg_color = SK_ColorWHITE;

  if (bg_color != body_background_color_) {
    body_background_color_ = bg_color;
    Send(new ViewHostMsg_DidChangeBodyBackgroundColor(
        GetRoutingID(), bg_color));
  }
#endif
}

void RenderViewImpl::SendFindReply(int request_id,
                                   int match_count,
                                   int ordinal,
                                   const WebRect& selection_rect,
                                   bool final_status_update) {
  Send(new ViewHostMsg_Find_Reply(routing_id_,
                                  request_id,
                                  match_count,
                                  selection_rect,
                                  ordinal,
                                  final_status_update));
}

// static
bool RenderViewImpl::ShouldUpdateSelectionTextFromContextMenuParams(
    const base::string16& selection_text,
    size_t selection_text_offset,
    const gfx::Range& selection_range,
    const ContextMenuParams& params) {
  base::string16 trimmed_selection_text;
  if (!selection_text.empty() && !selection_range.is_empty()) {
    const int start = selection_range.GetMin() - selection_text_offset;
    const size_t length = selection_range.length();
    if (start >= 0 && start + length <= selection_text.length()) {
      TrimWhitespace(selection_text.substr(start, length), TRIM_ALL,
                     &trimmed_selection_text);
    }
  }
  base::string16 trimmed_params_text;
  TrimWhitespace(params.selection_text, TRIM_ALL, &trimmed_params_text);
  return trimmed_params_text != trimmed_selection_text;
}

void RenderViewImpl::reportFindInPageMatchCount(int request_id,
                                                int count,
                                                bool final_update) {
  NOTREACHED();
}

void RenderViewImpl::reportFindInPageSelection(int request_id,
                                               int active_match_ordinal,
                                               const WebRect& selection_rect) {
  NOTREACHED();
}

void RenderViewImpl::requestStorageQuota(
    WebFrame* frame,
    WebStorageQuotaType type,
    unsigned long long requested_size,
    WebStorageQuotaCallbacks* callbacks) {
  NOTREACHED();
}

bool RenderViewImpl::willCheckAndDispatchMessageEvent(
    blink::WebFrame* sourceFrame,
    blink::WebFrame* targetFrame,
    blink::WebSecurityOrigin target_origin,
    blink::WebDOMMessageEvent event) {
  if (!is_swapped_out_)
    return false;

  ViewMsg_PostMessage_Params params;
  params.data = event.data().toString();
  params.source_origin = event.origin();
  if (!target_origin.isNull())
    params.target_origin = target_origin.toString();

  blink::WebMessagePortChannelArray channels = event.releaseChannels();
  if (!channels.isEmpty()) {
    std::vector<int> message_port_ids(channels.size());
     // Extract the port IDs from the channel array.
     for (size_t i = 0; i < channels.size(); ++i) {
       WebMessagePortChannelImpl* webchannel =
           static_cast<WebMessagePortChannelImpl*>(channels[i]);
       message_port_ids[i] = webchannel->message_port_id();
       webchannel->QueueMessages();
       DCHECK_NE(message_port_ids[i], MSG_ROUTING_NONE);
     }
     params.message_port_ids = message_port_ids;
  }

  // Include the routing ID for the source frame (if one exists), which the
  // browser process will translate into the routing ID for the equivalent
  // frame in the target process.
  params.source_routing_id = MSG_ROUTING_NONE;
  if (sourceFrame) {
    RenderViewImpl* source_view = FromWebView(sourceFrame->view());
    if (source_view)
      params.source_routing_id = source_view->routing_id();
  }

  Send(new ViewHostMsg_RouteMessageEvent(routing_id_, params));
  return true;
}

void RenderViewImpl::willOpenSocketStream(
    WebSocketStreamHandle* handle) {
  NOTREACHED();
}

void RenderViewImpl::willStartUsingPeerConnectionHandler(
    blink::WebFrame* frame, blink::WebRTCPeerConnectionHandler* handler) {
  NOTREACHED();
}

blink::WebString RenderViewImpl::acceptLanguages() {
  return WebString::fromUTF8(renderer_preferences_.accept_languages);
}

blink::WebString RenderViewImpl::userAgentOverride(
    blink::WebFrame* frame,
    const blink::WebURL& url) {
  NOTREACHED();
  return blink::WebString();
}

WebString RenderViewImpl::doNotTrackValue(WebFrame* frame) {
  NOTREACHED();
  return blink::WebString();
}

bool RenderViewImpl::allowWebGL(WebFrame* frame, bool default_value) {
  NOTREACHED();
  return false;
}

void RenderViewImpl::didLoseWebGLContext(
    blink::WebFrame* frame,
    int arb_robustness_status_code) {
  NOTREACHED();
}

// blink::WebPageSerializerClient implementation ------------------------------

void RenderViewImpl::didSerializeDataForFrame(
    const WebURL& frame_url,
    const WebCString& data,
    WebPageSerializerClient::PageSerializationStatus status) {
  Send(new ViewHostMsg_SendSerializedHtmlData(
    routing_id(),
    frame_url,
    data.data(),
    static_cast<int32>(status)));
}

// RenderView implementation ---------------------------------------------------

bool RenderViewImpl::Send(IPC::Message* message) {
  return RenderWidget::Send(message);
}

RenderFrame* RenderViewImpl::GetMainRenderFrame() {
  return main_render_frame_.get();
}

int RenderViewImpl::GetRoutingID() const {
  return routing_id_;
}

int RenderViewImpl::GetPageId() const {
  return page_id_;
}

gfx::Size RenderViewImpl::GetSize() const {
  return size();
}

WebPreferences& RenderViewImpl::GetWebkitPreferences() {
  return webkit_preferences_;
}

void RenderViewImpl::SetWebkitPreferences(const WebPreferences& preferences) {
  OnUpdateWebPreferences(preferences);
}

blink::WebView* RenderViewImpl::GetWebView() {
  return webview();
}

blink::WebNode RenderViewImpl::GetFocusedNode() const {
  if (!webview())
    return WebNode();
  WebFrame* focused_frame = webview()->focusedFrame();
  if (focused_frame) {
    WebDocument doc = focused_frame->document();
    if (!doc.isNull())
      return doc.focusedNode();
  }

  return WebNode();
}

blink::WebNode RenderViewImpl::GetContextMenuNode() const {
  return context_menu_node_;
}

bool RenderViewImpl::IsEditableNode(const WebNode& node) const {
  if (node.isNull())
    return false;

  if (node.isContentEditable())
    return true;

  if (node.isElementNode()) {
    const WebElement& element = node.toConst<WebElement>();
    if (element.isTextFormControlElement())
      return true;

    // Also return true if it has an ARIA role of 'textbox'.
    for (unsigned i = 0; i < element.attributeCount(); ++i) {
      if (LowerCaseEqualsASCII(element.attributeLocalName(i), "role")) {
        if (LowerCaseEqualsASCII(element.attributeValue(i), "textbox"))
          return true;
        break;
      }
    }
  }

  return false;
}

void RenderViewImpl::EvaluateScript(const base::string16& frame_xpath,
                                    const base::string16& jscript,
                                    int id,
                                    bool notify_result) {
  v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
  v8::Handle<v8::Value> result;
  WebFrame* web_frame = GetChildFrame(frame_xpath);
  if (web_frame)
    result = web_frame->executeScriptAndReturnValue(WebScriptSource(jscript));
  if (notify_result) {
    base::ListValue list;
    if (!result.IsEmpty() && web_frame) {
      v8::Local<v8::Context> context = web_frame->mainWorldScriptContext();
      v8::Context::Scope context_scope(context);
      V8ValueConverterImpl converter;
      converter.SetDateAllowed(true);
      converter.SetRegExpAllowed(true);
      base::Value* result_value = converter.FromV8Value(result, context);
      list.Set(0, result_value ? result_value : base::Value::CreateNullValue());
    } else {
      list.Set(0, base::Value::CreateNullValue());
    }
    Send(new ViewHostMsg_ScriptEvalResponse(routing_id_, id, list));
  }
}

bool RenderViewImpl::ShouldDisplayScrollbars(int width, int height) const {
  return (!send_preferred_size_changes_ ||
          (disable_scrollbars_size_limit_.width() <= width ||
           disable_scrollbars_size_limit_.height() <= height));
}

int RenderViewImpl::GetEnabledBindings() const {
  return enabled_bindings_;
}

bool RenderViewImpl::GetContentStateImmediately() const {
  return send_content_state_immediately_;
}

float RenderViewImpl::GetFilteredTimePerFrame() const {
  return filtered_time_per_frame();
}

int RenderViewImpl::ShowContextMenu(ContextMenuClient* client,
                                    const ContextMenuParams& params) {
  DCHECK(client);  // A null client means "internal" when we issue callbacks.
  ContextMenuParams our_params(params);
  our_params.custom_context.request_id = pending_context_menus_.Add(client);
  Send(new ViewHostMsg_ContextMenu(routing_id_, our_params));
  return our_params.custom_context.request_id;
}

void RenderViewImpl::CancelContextMenu(int request_id) {
  DCHECK(pending_context_menus_.Lookup(request_id));
  pending_context_menus_.Remove(request_id);
}

blink::WebPageVisibilityState RenderViewImpl::GetVisibilityState() const {
  return visibilityState();
}

void RenderViewImpl::RunModalAlertDialog(blink::WebFrame* frame,
                                         const blink::WebString& message) {
  return runModalAlertDialog(frame, message);
}

void RenderViewImpl::DidStartLoading() {
  didStartLoading();
}

void RenderViewImpl::DidStopLoading() {
  didStopLoading();
}

void RenderViewImpl::DidPlay(blink::WebMediaPlayer* player) {
  Send(new ViewHostMsg_MediaNotification(routing_id_,
                                         reinterpret_cast<int64>(player),
                                         player->hasVideo(),
                                         player->hasAudio(),
                                         true));
}

void RenderViewImpl::DidPause(blink::WebMediaPlayer* player) {
  Send(new ViewHostMsg_MediaNotification(routing_id_,
                                         reinterpret_cast<int64>(player),
                                         player->hasVideo(),
                                         player->hasAudio(),
                                         false));
}

void RenderViewImpl::PlayerGone(blink::WebMediaPlayer* player) {
  DidPause(player);
}

void RenderViewImpl::SyncNavigationState() {
  if (!webview())
    return;

  const WebHistoryItem& item = webview()->mainFrame()->currentHistoryItem();
  SendUpdateState(item);
}

void RenderViewImpl::SyncSelectionIfRequired() {
  WebFrame* frame = webview()->focusedFrame();
  if (!frame)
    return;

  base::string16 text;
  size_t offset;
  gfx::Range range;
#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_) {
    focused_pepper_plugin_->GetSurroundingText(&text, &range);
    offset = 0;  // Pepper API does not support offset reporting.
    // TODO(kinaba): cut as needed.
  } else
#endif
  {
    size_t location, length;
    if (!webview()->caretOrSelectionRange(&location, &length))
      return;

    range = gfx::Range(location, location + length);

    if (webview()->textInputInfo().type != blink::WebTextInputTypeNone) {
      // If current focused element is editable, we will send 100 more chars
      // before and after selection. It is for input method surrounding text
      // feature.
      if (location > kExtraCharsBeforeAndAfterSelection)
        offset = location - kExtraCharsBeforeAndAfterSelection;
      else
        offset = 0;
      length = location + length - offset + kExtraCharsBeforeAndAfterSelection;
      WebRange webrange = WebRange::fromDocumentRange(frame, offset, length);
      if (!webrange.isNull())
        text = WebRange::fromDocumentRange(frame, offset, length).toPlainText();
    } else {
      offset = location;
      text = frame->selectionAsText();
      // http://crbug.com/101435
      // In some case, frame->selectionAsText() returned text's length is not
      // equal to the length returned from webview()->caretOrSelectionRange().
      // So we have to set the range according to text.length().
      range.set_end(range.start() + text.length());
    }
  }

  // Sometimes we get repeated didChangeSelection calls from webkit when
  // the selection hasn't actually changed. We don't want to report these
  // because it will cause us to continually claim the X clipboard.
  if (selection_text_offset_ != offset ||
      selection_range_ != range ||
      selection_text_ != text) {
    selection_text_ = text;
    selection_text_offset_ = offset;
    selection_range_ = range;
    Send(new ViewHostMsg_SelectionChanged(routing_id_, text, offset, range));
  }
  UpdateSelectionBounds();
}

GURL RenderViewImpl::GetAlternateErrorPageURL(const GURL& failed_url,
                                              ErrorPageType error_type) {
  if (failed_url.SchemeIsSecure()) {
    // If the URL that failed was secure, then the embedding web page was not
    // expecting a network attacker to be able to manipulate its contents.  As
    // we fetch alternate error pages over HTTP, we would be allowing a network
    // attacker to manipulate the contents of the response if we tried to use
    // the link doctor here.
    return GURL();
  }

  // Grab the base URL from the browser process.
  if (!alternate_error_page_url_.is_valid())
    return GURL();

  // Strip query params from the failed URL.
  GURL::Replacements remove_params;
  remove_params.ClearUsername();
  remove_params.ClearPassword();
  remove_params.ClearQuery();
  remove_params.ClearRef();
  const GURL url_to_send = failed_url.ReplaceComponents(remove_params);
  // TODO(yuusuke): change to net::FormatUrl when link doctor
  // becomes unicode-capable.
  std::string spec_to_send = url_to_send.spec();
  // Notify link doctor of the url truncation by sending of "?" at the end.
  if (failed_url.has_query())
    spec_to_send.append("?");

  // Construct the query params to send to link doctor.
  std::string params(alternate_error_page_url_.query());
  params.append("&url=");
  params.append(net::EscapeQueryParamValue(spec_to_send, true));
  params.append("&sourceid=chrome");
  params.append("&error=");
  switch (error_type) {
    case DNS_ERROR:
      params.append("dnserror");
      break;

    case HTTP_404:
      params.append("http404");
      break;

    case CONNECTION_ERROR:
      params.append("connectionfailure");
      break;

    default:
      NOTREACHED() << "unknown ErrorPageType";
  }

  // OK, build the final url to return.
  GURL::Replacements link_doctor_params;
  link_doctor_params.SetQueryStr(params);
  GURL url = alternate_error_page_url_.ReplaceComponents(link_doctor_params);
  return url;
}

GURL RenderViewImpl::GetLoadingUrl(blink::WebFrame* frame) const {
  WebDataSource* ds = frame->dataSource();
  if (ds->hasUnreachableURL())
    return ds->unreachableURL();

  const WebURLRequest& request = ds->request();
  return request.url();
}

blink::WebPlugin* RenderViewImpl::GetWebPluginFromPluginDocument() {
  return webview()->mainFrame()->document().to<WebPluginDocument>().plugin();
}

void RenderViewImpl::OnFind(int request_id,
                            const base::string16& search_text,
                            const WebFindOptions& options) {
  WebFrame* main_frame = webview()->mainFrame();

  // Check if the plugin still exists in the document.
  if (main_frame->document().isPluginDocument() &&
      GetWebPluginFromPluginDocument()) {
    if (options.findNext) {
      // Just navigate back/forward.
      GetWebPluginFromPluginDocument()->selectFindResult(options.forward);
    } else {
      if (!GetWebPluginFromPluginDocument()->startFind(
          search_text, options.matchCase, request_id)) {
        // Send "no results".
        SendFindReply(request_id, 0, 0, gfx::Rect(), true);
      }
    }
    return;
  }

  WebFrame* frame_after_main = main_frame->traverseNext(true);
  WebFrame* focused_frame = webview()->focusedFrame();
  WebFrame* search_frame = focused_frame;  // start searching focused frame.

  bool multi_frame = (frame_after_main != main_frame);

  // If we have multiple frames, we don't want to wrap the search within the
  // frame, so we check here if we only have main_frame in the chain.
  bool wrap_within_frame = !multi_frame;

  WebRect selection_rect;
  bool result = false;

  // If something is selected when we start searching it means we cannot just
  // increment the current match ordinal; we need to re-generate it.
  WebRange current_selection = focused_frame->selectionRange();

  do {
    result = search_frame->find(
        request_id, search_text, options, wrap_within_frame, &selection_rect);

    if (!result) {
      // don't leave text selected as you move to the next frame.
      search_frame->executeCommand(WebString::fromUTF8("Unselect"),
                                   GetFocusedNode());

      // Find the next frame, but skip the invisible ones.
      do {
        // What is the next frame to search? (we might be going backwards). Note
        // that we specify wrap=true so that search_frame never becomes NULL.
        search_frame = options.forward ?
            search_frame->traverseNext(true) :
            search_frame->traversePrevious(true);
      } while (!search_frame->hasVisibleContent() &&
               search_frame != focused_frame);

      // Make sure selection doesn't affect the search operation in new frame.
      search_frame->executeCommand(WebString::fromUTF8("Unselect"),
                                   GetFocusedNode());

      // If we have multiple frames and we have wrapped back around to the
      // focused frame, we need to search it once more allowing wrap within
      // the frame, otherwise it will report 'no match' if the focused frame has
      // reported matches, but no frames after the focused_frame contain a
      // match for the search word(s).
      if (multi_frame && search_frame == focused_frame) {
        result = search_frame->find(
            request_id, search_text, options, true,  // Force wrapping.
            &selection_rect);
      }
    }

    webview()->setFocusedFrame(search_frame);
  } while (!result && search_frame != focused_frame);

  if (options.findNext && current_selection.isNull()) {
    // Force the main_frame to report the actual count.
    main_frame->increaseMatchCount(0, request_id);
  } else {
    // If nothing is found, set result to "0 of 0", otherwise, set it to
    // "-1 of 1" to indicate that we found at least one item, but we don't know
    // yet what is active.
    int ordinal = result ? -1 : 0;  // -1 here means, we might know more later.
    int match_count = result ? 1 : 0;  // 1 here means possibly more coming.

    // If we find no matches then this will be our last status update.
    // Otherwise the scoping effort will send more results.
    bool final_status_update = !result;

    SendFindReply(request_id, match_count, ordinal, selection_rect,
                  final_status_update);

    // Scoping effort begins, starting with the mainframe.
    search_frame = main_frame;

    main_frame->resetMatchCount();

    do {
      // Cancel all old scoping requests before starting a new one.
      search_frame->cancelPendingScopingEffort();

      // We don't start another scoping effort unless at least one match has
      // been found.
      if (result) {
        // Start new scoping request. If the scoping function determines that it
        // needs to scope, it will defer until later.
        search_frame->scopeStringMatches(request_id,
                                         search_text,
                                         options,
                                         true);  // reset the tickmarks
      }

      // Iterate to the next frame. The frame will not necessarily scope, for
      // example if it is not visible.
      search_frame = search_frame->traverseNext(true);
    } while (search_frame != main_frame);
  }
}

void RenderViewImpl::OnStopFinding(StopFindAction action) {
  WebView* view = webview();
  if (!view)
    return;

  WebDocument doc = view->mainFrame()->document();
  if (doc.isPluginDocument() && GetWebPluginFromPluginDocument()) {
    GetWebPluginFromPluginDocument()->stopFind();
    return;
  }

  bool clear_selection = action == STOP_FIND_ACTION_CLEAR_SELECTION;
  if (clear_selection) {
    view->focusedFrame()->executeCommand(WebString::fromUTF8("Unselect"),
                                         GetFocusedNode());
  }

  WebFrame* frame = view->mainFrame();
  while (frame) {
    frame->stopFinding(clear_selection);
    frame = frame->traverseNext(false);
  }

  if (action == STOP_FIND_ACTION_ACTIVATE_SELECTION) {
    WebFrame* focused_frame = view->focusedFrame();
    if (focused_frame) {
      WebDocument doc = focused_frame->document();
      if (!doc.isNull()) {
        WebNode node = doc.focusedNode();
        if (!node.isNull())
          node.simulateClick();
      }
    }
  }
}

#if defined(OS_ANDROID)
void RenderViewImpl::OnActivateNearestFindResult(int request_id,
                                                 float x, float y) {
  if (!webview())
      return;

  WebFrame* main_frame = webview()->mainFrame();
  WebRect selection_rect;
  int ordinal = main_frame->selectNearestFindMatch(WebFloatPoint(x, y),
                                                   &selection_rect);
  if (ordinal == -1) {
    // Something went wrong, so send a no-op reply (force the main_frame to
    // report the current match count) in case the host is waiting for a
    // response due to rate-limiting).
    main_frame->increaseMatchCount(0, request_id);
    return;
  }

  SendFindReply(request_id,
                -1 /* number_of_matches */,
                ordinal,
                selection_rect,
                true /* final_update */);
}

void RenderViewImpl::OnFindMatchRects(int current_version) {
  if (!webview())
      return;

  WebFrame* main_frame = webview()->mainFrame();
  std::vector<gfx::RectF> match_rects;

  int rects_version = main_frame->findMatchMarkersVersion();
  if (current_version != rects_version) {
    WebVector<WebFloatRect> web_match_rects;
    main_frame->findMatchRects(web_match_rects);
    match_rects.reserve(web_match_rects.size());
    for (size_t i = 0; i < web_match_rects.size(); ++i)
      match_rects.push_back(gfx::RectF(web_match_rects[i]));
  }

  gfx::RectF active_rect = main_frame->activeFindMatchRect();
  Send(new ViewHostMsg_FindMatchRects_Reply(routing_id_,
                                               rects_version,
                                               match_rects,
                                               active_rect));
}
#endif

void RenderViewImpl::OnZoom(PageZoom zoom) {
  if (!webview())  // Not sure if this can happen, but no harm in being safe.
    return;

  webview()->hidePopups();

  double old_zoom_level = webview()->zoomLevel();
  double zoom_level;
  if (zoom == PAGE_ZOOM_RESET) {
    zoom_level = 0;
  } else if (static_cast<int>(old_zoom_level) == old_zoom_level) {
    // Previous zoom level is a whole number, so just increment/decrement.
    zoom_level = old_zoom_level + zoom;
  } else {
    // Either the user hit the zoom factor limit and thus the zoom level is now
    // not a whole number, or a plugin changed it to a custom value.  We want
    // to go to the next whole number so that the user can always get back to
    // 100% with the keyboard/menu.
    if ((old_zoom_level > 1 && zoom > 0) ||
        (old_zoom_level < 1 && zoom < 0)) {
      zoom_level = static_cast<int>(old_zoom_level + zoom);
    } else {
      // We're going towards 100%, so first go to the next whole number.
      zoom_level = static_cast<int>(old_zoom_level);
    }
  }
  webview()->setZoomLevel(zoom_level);
  zoomLevelChanged();
}

void RenderViewImpl::OnZoomFactor(PageZoom zoom, int zoom_center_x,
                                  int zoom_center_y) {
  ZoomFactorHelper(zoom, zoom_center_x, zoom_center_y,
                   kScalingIncrementForGesture);
}

void RenderViewImpl::ZoomFactorHelper(PageZoom zoom,
                                      int zoom_center_x,
                                      int zoom_center_y,
                                      float scaling_increment) {
  if (!webview())  // Not sure if this can happen, but no harm in being safe.
    return;

  double old_page_scale_factor = webview()->pageScaleFactor();
  double page_scale_factor;
  if (zoom == PAGE_ZOOM_RESET) {
    page_scale_factor = 1.0;
  } else {
    page_scale_factor = old_page_scale_factor +
        (zoom > 0 ? scaling_increment : -scaling_increment);
  }
  if (page_scale_factor > 0) {
    webview()->setPageScaleFactor(page_scale_factor,
                                  WebPoint(zoom_center_x, zoom_center_y));
  }
}

void RenderViewImpl::OnSetZoomLevel(double zoom_level) {
  webview()->hidePopups();
  webview()->setZoomLevel(zoom_level);
  zoomLevelChanged();
}

void RenderViewImpl::OnSetZoomLevelForLoadingURL(const GURL& url,
                                                 double zoom_level) {
#if !defined(OS_ANDROID)
  // On Android, page zoom isn't used, and in case of WebView, text zoom is used
  // for legacy WebView text scaling emulation. Thus, the code that resets
  // the zoom level from this map will be effectively resetting text zoom level.
  host_zoom_levels_[url] = zoom_level;
#endif
}

void RenderViewImpl::OnSetPageEncoding(const std::string& encoding_name) {
  webview()->setPageEncoding(WebString::fromUTF8(encoding_name));
}

void RenderViewImpl::OnResetPageEncodingToDefault() {
  WebString no_encoding;
  webview()->setPageEncoding(no_encoding);
}

WebFrame* RenderViewImpl::GetChildFrame(const base::string16& xpath) const {
  if (xpath.empty())
    return webview()->mainFrame();

  // xpath string can represent a frame deep down the tree (across multiple
  // frame DOMs).
  // Example, /html/body/table/tbody/tr/td/iframe\n/frameset/frame[0]
  // should break into 2 xpaths
  // /html/body/table/tbody/tr/td/iframe & /frameset/frame[0]
  std::vector<base::string16> xpaths;
  base::SplitString(xpath, '\n', &xpaths);

  WebFrame* frame = webview()->mainFrame();
  for (std::vector<base::string16>::const_iterator i = xpaths.begin();
       frame && i != xpaths.end(); ++i) {
    frame = frame->findChildByExpression(*i);
  }

  return frame;
}

void RenderViewImpl::OnScriptEvalRequest(const base::string16& frame_xpath,
                                         const base::string16& jscript,
                                         int id,
                                         bool notify_result) {
  TRACE_EVENT_INSTANT0("test_tracing", "OnScriptEvalRequest",
                       TRACE_EVENT_SCOPE_THREAD);
  EvaluateScript(frame_xpath, jscript, id, notify_result);
}

void RenderViewImpl::OnPostMessageEvent(
    const ViewMsg_PostMessage_Params& params) {
  // TODO(nasko): Support sending to subframes.
  WebFrame* frame = webview()->mainFrame();

  // Find the source frame if it exists.
  WebFrame* source_frame = NULL;
  if (params.source_routing_id != MSG_ROUTING_NONE) {
    RenderViewImpl* source_view = FromRoutingID(params.source_routing_id);
    if (source_view)
      source_frame = source_view->webview()->mainFrame();
  }

  // If the message contained MessagePorts, create the corresponding endpoints.
  DCHECK_EQ(params.message_port_ids.size(), params.new_routing_ids.size());
  blink::WebMessagePortChannelArray channels(params.message_port_ids.size());
  for (size_t i = 0;
       i < params.message_port_ids.size() && i < params.new_routing_ids.size();
       ++i) {
    channels[i] =
        new WebMessagePortChannelImpl(params.new_routing_ids[i],
                                      params.message_port_ids[i],
                                      base::MessageLoopProxy::current().get());
  }

  // Create an event with the message.  The final parameter to initMessageEvent
  // is the last event ID, which is not used with postMessage.
  WebDOMEvent event = frame->document().createEvent("MessageEvent");
  WebDOMMessageEvent msg_event = event.to<WebDOMMessageEvent>();
  msg_event.initMessageEvent("message",
                             // |canBubble| and |cancellable| are always false
                             false, false,
                             WebSerializedScriptValue::fromString(params.data),
                             params.source_origin, source_frame, "", channels);

  // We must pass in the target_origin to do the security check on this side,
  // since it may have changed since the original postMessage call was made.
  WebSecurityOrigin target_origin;
  if (!params.target_origin.empty()) {
    target_origin =
        WebSecurityOrigin::createFromString(WebString(params.target_origin));
  }
  frame->dispatchMessageEventWithOriginCheck(target_origin, msg_event);
}

void RenderViewImpl::OnCSSInsertRequest(const base::string16& frame_xpath,
                                        const std::string& css) {
  WebFrame* frame = GetChildFrame(frame_xpath);
  if (!frame)
    return;

  frame->document().insertUserStyleSheet(
      WebString::fromUTF8(css),
      WebDocument::UserStyleAuthorLevel);
}

void RenderViewImpl::OnAllowBindings(int enabled_bindings_flags) {
  if ((enabled_bindings_flags & BINDINGS_POLICY_WEB_UI) &&
      !(enabled_bindings_ & BINDINGS_POLICY_WEB_UI)) {
    // WebUI uses <dialog> which is not yet enabled by default in Chrome.
    WebRuntimeFeatures::enableDialogElement(true);

    RenderThread::Get()->RegisterExtension(WebUIExtension::Get());
    new WebUIExtensionData(this);
  }

  enabled_bindings_ |= enabled_bindings_flags;

  // Keep track of the total bindings accumulated in this process.
  RenderProcess::current()->AddBindings(enabled_bindings_flags);
}

void RenderViewImpl::OnDragTargetDragEnter(const DropData& drop_data,
                                           const gfx::Point& client_point,
                                           const gfx::Point& screen_point,
                                           WebDragOperationsMask ops,
                                           int key_modifiers) {
  WebDragOperation operation = webview()->dragTargetDragEnter(
      DropDataToWebDragData(drop_data),
      client_point,
      screen_point,
      ops,
      key_modifiers);

  Send(new DragHostMsg_UpdateDragCursor(routing_id_, operation));
}

void RenderViewImpl::OnDragTargetDragOver(const gfx::Point& client_point,
                                          const gfx::Point& screen_point,
                                          WebDragOperationsMask ops,
                                          int key_modifiers) {
  WebDragOperation operation = webview()->dragTargetDragOver(
      client_point,
      screen_point,
      ops,
      key_modifiers);

  Send(new DragHostMsg_UpdateDragCursor(routing_id_, operation));
}

void RenderViewImpl::OnDragTargetDragLeave() {
  webview()->dragTargetDragLeave();
}

void RenderViewImpl::OnDragTargetDrop(const gfx::Point& client_point,
                                      const gfx::Point& screen_point,
                                      int key_modifiers) {
  webview()->dragTargetDrop(client_point, screen_point, key_modifiers);

  Send(new DragHostMsg_TargetDrop_ACK(routing_id_));
}

void RenderViewImpl::OnDragSourceEndedOrMoved(const gfx::Point& client_point,
                                              const gfx::Point& screen_point,
                                              bool ended,
                                              WebDragOperation op) {
  if (ended) {
    webview()->dragSourceEndedAt(client_point, screen_point, op);
  } else {
    webview()->dragSourceMovedTo(client_point, screen_point, op);
  }
}

void RenderViewImpl::OnDragSourceSystemDragEnded() {
  webview()->dragSourceSystemDragEnded();
}

void RenderViewImpl::OnUpdateWebPreferences(const WebPreferences& prefs) {
  webkit_preferences_ = prefs;
  ApplyWebPreferences(webkit_preferences_, webview());
}

void RenderViewImpl::OnUpdateTimezone() {
  if (webview())
    NotifyTimezoneChange(webview()->mainFrame());
}

void RenderViewImpl::OnSetAltErrorPageURL(const GURL& url) {
  alternate_error_page_url_ = url;
}

void RenderViewImpl::OnCustomContextMenuAction(
    const CustomContextMenuContext& custom_context,
    unsigned action) {
  if (custom_context.request_id) {
    // External context menu request, look in our map.
    ContextMenuClient* client =
        pending_context_menus_.Lookup(custom_context.request_id);
    if (client)
      client->OnMenuAction(custom_context.request_id, action);
  } else {
    // Internal request, forward to WebKit.
    webview()->performCustomContextMenuAction(action);
  }
}

void RenderViewImpl::OnEnumerateDirectoryResponse(
    int id,
    const std::vector<base::FilePath>& paths) {
  if (!enumeration_completions_[id])
    return;

  WebVector<WebString> ws_file_names(paths.size());
  for (size_t i = 0; i < paths.size(); ++i)
    ws_file_names[i] = paths[i].AsUTF16Unsafe();

  enumeration_completions_[id]->didChooseFile(ws_file_names);
  enumeration_completions_.erase(id);
}

void RenderViewImpl::OnFileChooserResponse(
    const std::vector<ui::SelectedFileInfo>& files) {
  // This could happen if we navigated to a different page before the user
  // closed the chooser.
  if (file_chooser_completions_.empty())
    return;

  // Convert Chrome's SelectedFileInfo list to WebKit's.
  WebVector<WebFileChooserCompletion::SelectedFileInfo> selected_files(
      files.size());
  for (size_t i = 0; i < files.size(); ++i) {
    WebFileChooserCompletion::SelectedFileInfo selected_file;
    selected_file.path = files[i].local_path.AsUTF16Unsafe();
    selected_file.displayName =
        base::FilePath(files[i].display_name).AsUTF16Unsafe();
    selected_files[i] = selected_file;
  }

  if (file_chooser_completions_.front()->completion)
    file_chooser_completions_.front()->completion->didChooseFile(
        selected_files);
  file_chooser_completions_.pop_front();

  // If there are more pending file chooser requests, schedule one now.
  if (!file_chooser_completions_.empty()) {
    Send(new ViewHostMsg_RunFileChooser(routing_id_,
        file_chooser_completions_.front()->params));
  }
}

void RenderViewImpl::OnEnableAutoResize(const gfx::Size& min_size,
                                        const gfx::Size& max_size) {
  DCHECK(disable_scrollbars_size_limit_.IsEmpty());
  if (!webview())
    return;
  auto_resize_mode_ = true;
  webview()->enableAutoResizeMode(min_size, max_size);
}

void RenderViewImpl::OnDisableAutoResize(const gfx::Size& new_size) {
  DCHECK(disable_scrollbars_size_limit_.IsEmpty());
  if (!webview())
    return;
  auto_resize_mode_ = false;
  webview()->disableAutoResizeMode();

  if (!new_size.IsEmpty()) {
    Resize(new_size,
           physical_backing_size_,
           overdraw_bottom_height_,
           resizer_rect_,
           is_fullscreen_,
           NO_RESIZE_ACK);
  }
}

void RenderViewImpl::OnEnablePreferredSizeChangedMode() {
  if (send_preferred_size_changes_)
    return;
  send_preferred_size_changes_ = true;

  // Start off with an initial preferred size notification (in case
  // |didUpdateLayout| was already called).
  didUpdateLayout();
}

void RenderViewImpl::OnDisableScrollbarsForSmallWindows(
    const gfx::Size& disable_scrollbar_size_limit) {
  disable_scrollbars_size_limit_ = disable_scrollbar_size_limit;
}

void RenderViewImpl::OnSetRendererPrefs(
    const RendererPreferences& renderer_prefs) {
  double old_zoom_level = renderer_preferences_.default_zoom_level;
  renderer_preferences_ = renderer_prefs;
  UpdateFontRenderingFromRendererPrefs();

#if defined(USE_DEFAULT_RENDER_THEME) || defined(TOOLKIT_GTK)
  if (renderer_prefs.use_custom_colors) {
    WebColorName name = blink::WebColorWebkitFocusRingColor;
    blink::setNamedColors(&name, &renderer_prefs.focus_ring_color, 1);
    blink::setCaretBlinkInterval(renderer_prefs.caret_blink_interval);
#if defined(TOOLKIT_GTK)
    ui::NativeTheme::instance()->SetScrollbarColors(
        renderer_prefs.thumb_inactive_color,
        renderer_prefs.thumb_active_color,
        renderer_prefs.track_color);
#endif  // defined(TOOLKIT_GTK)

    if (webview()) {
      webview()->setSelectionColors(
          renderer_prefs.active_selection_bg_color,
          renderer_prefs.active_selection_fg_color,
          renderer_prefs.inactive_selection_bg_color,
          renderer_prefs.inactive_selection_fg_color);
      webview()->themeChanged();
    }
  }
#endif  // defined(USE_DEFAULT_RENDER_THEME) || defined(TOOLKIT_GTK)

  if (RenderThreadImpl::current())  // Will be NULL during unit tests.
    RenderThreadImpl::current()->SetFlingCurveParameters(
        renderer_prefs.touchpad_fling_profile,
        renderer_prefs.touchscreen_fling_profile);

  // If the zoom level for this page matches the old zoom default, and this
  // is not a plugin, update the zoom level to match the new default.
  if (webview() && !webview()->mainFrame()->document().isPluginDocument() &&
      !ZoomValuesEqual(old_zoom_level,
                       renderer_preferences_.default_zoom_level) &&
      ZoomValuesEqual(webview()->zoomLevel(), old_zoom_level)) {
    webview()->setZoomLevel(renderer_preferences_.default_zoom_level);
    zoomLevelChanged();
  }
}

void RenderViewImpl::OnMediaPlayerActionAt(const gfx::Point& location,
                                           const WebMediaPlayerAction& action) {
  if (webview())
    webview()->performMediaPlayerAction(action, location);
}

void RenderViewImpl::OnOrientationChangeEvent(int orientation) {
  // Screen has rotated. 0 = default (portrait), 90 = one turn right, and so on.
  FOR_EACH_OBSERVER(RenderViewObserver,
                    observers_,
                    OrientationChangeEvent(orientation));
  webview()->mainFrame()->sendOrientationChangeEvent(orientation);
}

void RenderViewImpl::OnPluginActionAt(const gfx::Point& location,
                                      const WebPluginAction& action) {
  if (webview())
    webview()->performPluginAction(action, location);
}

void RenderViewImpl::OnGetAllSavableResourceLinksForCurrentPage(
    const GURL& page_url) {
  // Prepare list to storage all savable resource links.
  std::vector<GURL> resources_list;
  std::vector<GURL> referrer_urls_list;
  std::vector<blink::WebReferrerPolicy> referrer_policies_list;
  std::vector<GURL> frames_list;
  SavableResourcesResult result(&resources_list,
                                &referrer_urls_list,
                                &referrer_policies_list,
                                &frames_list);

  // webkit/ doesn't know about Referrer.
  if (!GetAllSavableResourceLinksForCurrentPage(
          webview(),
          page_url,
          &result,
          const_cast<const char**>(GetSavableSchemes()))) {
    // If something is wrong when collecting all savable resource links,
    // send empty list to embedder(browser) to tell it failed.
    referrer_urls_list.clear();
    referrer_policies_list.clear();
    resources_list.clear();
    frames_list.clear();
  }

  std::vector<Referrer> referrers_list;
  CHECK_EQ(referrer_urls_list.size(), referrer_policies_list.size());
  for (unsigned i = 0; i < referrer_urls_list.size(); ++i) {
    referrers_list.push_back(
        Referrer(referrer_urls_list[i], referrer_policies_list[i]));
  }

  // Send result of all savable resource links to embedder.
  Send(new ViewHostMsg_SendCurrentPageAllSavableResourceLinks(routing_id(),
                                                              resources_list,
                                                              referrers_list,
                                                              frames_list));
}

void RenderViewImpl::OnGetSerializedHtmlDataForCurrentPageWithLocalLinks(
    const std::vector<GURL>& links,
    const std::vector<base::FilePath>& local_paths,
    const base::FilePath& local_directory_name) {

  // Convert std::vector of GURLs to WebVector<WebURL>
  WebVector<WebURL> weburl_links(links);

  // Convert std::vector of base::FilePath to WebVector<WebString>
  WebVector<WebString> webstring_paths(local_paths.size());
  for (size_t i = 0; i < local_paths.size(); i++)
    webstring_paths[i] = local_paths[i].AsUTF16Unsafe();

  WebPageSerializer::serialize(webview()->mainFrame(), true, this, weburl_links,
                               webstring_paths,
                               local_directory_name.AsUTF16Unsafe());
}

void RenderViewImpl::OnShouldClose() {
  base::TimeTicks before_unload_start_time = base::TimeTicks::Now();
  bool should_close = webview()->dispatchBeforeUnloadEvent();
  base::TimeTicks before_unload_end_time = base::TimeTicks::Now();
  Send(new ViewHostMsg_ShouldClose_ACK(routing_id_, should_close,
                                       before_unload_start_time,
                                       before_unload_end_time));
}

void RenderViewImpl::OnSuppressDialogsUntilSwapOut() {
  // Don't show any more dialogs until we finish OnSwapOut.
  suppress_dialogs_until_swap_out_ = true;
}

void RenderViewImpl::OnSwapOut() {
  // Only run unload if we're not swapped out yet, but send the ack either way.
  if (!is_swapped_out_) {
    // Swap this RenderView out so the tab can navigate to a page rendered by a
    // different process.  This involves running the unload handler and clearing
    // the page.  Once WasSwappedOut is called, we also allow this process to
    // exit if there are no other active RenderViews in it.

    // Send an UpdateState message before we get swapped out.
    SyncNavigationState();

    // Synchronously run the unload handler before sending the ACK.
    webview()->dispatchUnloadEvent();

    // Swap out and stop sending any IPC messages that are not ACKs.
    SetSwappedOut(true);

    // Now that we're swapped out and filtering IPC messages, stop loading to
    // ensure that no other in-progress navigation continues.  We do this here
    // to avoid sending a DidStopLoading message to the browser process.
    OnStop();

    // Replace the page with a blank dummy URL. The unload handler will not be
    // run a second time, thanks to a check in FrameLoader::stopLoading.
    // TODO(creis): Need to add a better way to do this that avoids running the
    // beforeunload handler. For now, we just run it a second time silently.
    NavigateToSwappedOutURL(webview()->mainFrame());

    // Let WebKit know that this view is hidden so it can drop resources and
    // stop compositing.
    webview()->setVisibilityState(blink::WebPageVisibilityStateHidden, false);
  }

  // It is now safe to show modal dialogs again.
  suppress_dialogs_until_swap_out_ = false;

  Send(new ViewHostMsg_SwapOut_ACK(routing_id_));
}

void RenderViewImpl::NavigateToSwappedOutURL(blink::WebFrame* frame) {
  // We use loadRequest instead of loadHTMLString because the former commits
  // synchronously.  Otherwise a new navigation can interrupt the navigation
  // to kSwappedOutURL. If that happens to be to the page we had been
  // showing, then WebKit will never send a commit and we'll be left spinning.
  CHECK(is_swapped_out_);
  GURL swappedOutURL(kSwappedOutURL);
  WebURLRequest request(swappedOutURL);
  frame->loadRequest(request);
}

void RenderViewImpl::OnClosePage() {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, ClosePage());
  // TODO(creis): We'd rather use webview()->Close() here, but that currently
  // sets the WebView's delegate_ to NULL, preventing any JavaScript dialogs
  // in the onunload handler from appearing.  For now, we're bypassing that and
  // calling the FrameLoader's CloseURL method directly.  This should be
  // revisited to avoid having two ways to close a page.  Having a single way
  // to close that can run onunload is also useful for fixing
  // http://b/issue?id=753080.
  webview()->dispatchUnloadEvent();

  Send(new ViewHostMsg_ClosePage_ACK(routing_id_));
}

void RenderViewImpl::OnThemeChanged() {
#if defined(USE_AURA)
  // Aura doesn't care if we switch themes.
#elif defined(OS_WIN)
  ui::NativeThemeWin::instance()->CloseHandles();
  if (webview())
    webview()->themeChanged();
#else  // defined(OS_WIN)
  // TODO(port): we don't support theming on non-Windows platforms yet
  NOTIMPLEMENTED();
#endif
}

bool RenderViewImpl::MaybeLoadAlternateErrorPage(WebFrame* frame,
                                                 const WebURLError& error,
                                                 bool replace) {
  // We only show alternate error pages in the main frame.  They are
  // intended to assist the user when navigating, so there is not much
  // value in showing them for failed subframes.  Ideally, we would be
  // able to use the TYPED transition type for this, but that flag is
  // not preserved across page reloads.
  if (frame->parent())
    return false;

  // Use the alternate error page service if this is a DNS failure or
  // connection failure.
  int ec = error.reason;
  if (ec != net::ERR_NAME_NOT_RESOLVED &&
      ec != net::ERR_CONNECTION_FAILED &&
      ec != net::ERR_CONNECTION_REFUSED &&
      ec != net::ERR_ADDRESS_UNREACHABLE &&
      ec != net::ERR_CONNECTION_TIMED_OUT) {
    return false;
  }

  const GURL& error_page_url = GetAlternateErrorPageURL(error.unreachableURL,
      ec == net::ERR_NAME_NOT_RESOLVED ? DNS_ERROR : CONNECTION_ERROR);
  if (!error_page_url.is_valid())
    return false;

  WebDataSource* ds = frame->provisionalDataSource();
  const WebURLRequest& failed_request = ds->request();

  // Load an empty page first so there is an immediate response to the error,
  // and then kick off a request for the alternate error page.
  frame->loadHTMLString(std::string(),
                        GURL(kUnreachableWebDataURL),
                        error.unreachableURL,
                        replace);

  // Now, create a fetcher for the error page and associate it with the data
  // source we just created via the LoadHTMLString call.  That way if another
  // navigation occurs, the fetcher will get destroyed.
  InternalDocumentStateData* internal_data =
      InternalDocumentStateData::FromDataSource(frame->provisionalDataSource());
  internal_data->set_alt_error_page_fetcher(
      new AltErrorPageResourceFetcher(
          error_page_url, frame, failed_request, error,
          base::Bind(&RenderViewImpl::AltErrorPageFinished,
                     base::Unretained(this))));
  return true;
}

void RenderViewImpl::AltErrorPageFinished(WebFrame* frame,
                                          const WebURLRequest& original_request,
                                          const WebURLError& original_error,
                                          const std::string& html) {
  // Here, we replace the blank page we loaded previously.
  // If we failed to download the alternate error page, LoadNavigationErrorPage
  // will simply display a default error page.
  LoadNavigationErrorPage(frame, original_request, original_error, html, true);
}

void RenderViewImpl::OnMoveOrResizeStarted() {
  if (webview())
    webview()->hidePopups();
}

void RenderViewImpl::OnResize(const ViewMsg_Resize_Params& params) {
  if (webview()) {
    webview()->hidePopups();
    if (send_preferred_size_changes_) {
      webview()->mainFrame()->setCanHaveScrollbars(
          ShouldDisplayScrollbars(params.new_size.width(),
                                  params.new_size.height()));
    }
    UpdateScrollState(webview()->mainFrame());
  }

  RenderWidget::OnResize(params);
}

void RenderViewImpl::DidInitiatePaint() {
#if defined(ENABLE_PLUGINS)
  main_render_frame_->DidInitiatePaint();
#endif
}

void RenderViewImpl::DidFlushPaint() {
#if defined(ENABLE_PLUGINS)
  main_render_frame_->DidFlushPaint();
#endif

  // If the RenderWidget is closing down then early-exit, otherwise we'll crash.
  // See crbug.com/112921.
  if (!webview())
    return;

  WebFrame* main_frame = webview()->mainFrame();

  // If we have a provisional frame we are between the start and commit stages
  // of loading and we don't want to save stats.
  if (!main_frame->provisionalDataSource()) {
    WebDataSource* ds = main_frame->dataSource();
    DocumentState* document_state = DocumentState::FromDataSource(ds);
    InternalDocumentStateData* data =
        InternalDocumentStateData::FromDocumentState(document_state);
    if (data->did_first_visually_non_empty_layout() &&
        !data->did_first_visually_non_empty_paint()) {
      data->set_did_first_visually_non_empty_paint(true);
      Send(new ViewHostMsg_DidFirstVisuallyNonEmptyPaint(routing_id_,
                                                         page_id_));
    }

    // TODO(jar): The following code should all be inside a method, probably in
    // NavigatorState.
    Time now = Time::Now();
    if (document_state->first_paint_time().is_null()) {
      document_state->set_first_paint_time(now);
    }
    if (document_state->first_paint_after_load_time().is_null() &&
        !document_state->finish_load_time().is_null()) {
      document_state->set_first_paint_after_load_time(now);
    }
  }
}

PepperPluginInstanceImpl* RenderViewImpl::GetBitmapForOptimizedPluginPaint(
    const gfx::Rect& paint_bounds,
    TransportDIB** dib,
    gfx::Rect* location,
    gfx::Rect* clip,
    float* scale_factor) {
#if defined(ENABLE_PLUGINS)
  return main_render_frame_->GetBitmapForOptimizedPluginPaint(
      paint_bounds, dib, location, clip, scale_factor);
#endif
  return NULL;
}

gfx::Vector2d RenderViewImpl::GetScrollOffset() {
  WebSize scroll_offset = webview()->mainFrame()->scrollOffset();
  return gfx::Vector2d(scroll_offset.width, scroll_offset.height);
}

void RenderViewImpl::OnClearFocusedNode() {
  if (webview())
    webview()->clearFocusedNode();
}

void RenderViewImpl::OnSetBackground(const SkBitmap& background) {
  if (webview())
    webview()->setIsTransparent(!background.empty());
  if (compositor_)
    compositor_->setHasTransparentBackground(!background.empty());

  SetBackground(background);
}

void RenderViewImpl::OnSetAccessibilityMode(AccessibilityMode new_mode) {
  if (accessibility_mode_ == new_mode)
    return;
  accessibility_mode_ = new_mode;
  if (renderer_accessibility_) {
    delete renderer_accessibility_;
    renderer_accessibility_ = NULL;
  }
  if (accessibility_mode_ == AccessibilityModeComplete)
    renderer_accessibility_ = new RendererAccessibilityComplete(this);
#if !defined(OS_ANDROID)
  else if (accessibility_mode_ == AccessibilityModeEditableTextOnly)
    renderer_accessibility_ = new RendererAccessibilityFocusOnly(this);
#endif
}

void RenderViewImpl::OnSetActive(bool active) {
  if (webview())
    webview()->setIsActive(active);

#if defined(ENABLE_PLUGINS) && defined(OS_MACOSX)
  std::set<WebPluginDelegateProxy*>::iterator plugin_it;
  for (plugin_it = plugin_delegates_.begin();
       plugin_it != plugin_delegates_.end(); ++plugin_it) {
    (*plugin_it)->SetWindowFocus(active);
  }
#endif
}

#if defined(OS_MACOSX)
void RenderViewImpl::OnSetWindowVisibility(bool visible) {
#if defined(ENABLE_PLUGINS)
  // Inform plugins that their container has changed visibility.
  std::set<WebPluginDelegateProxy*>::iterator plugin_it;
  for (plugin_it = plugin_delegates_.begin();
       plugin_it != plugin_delegates_.end(); ++plugin_it) {
    (*plugin_it)->SetContainerVisibility(visible);
  }
#endif
}

void RenderViewImpl::OnWindowFrameChanged(const gfx::Rect& window_frame,
                                          const gfx::Rect& view_frame) {
#if defined(ENABLE_PLUGINS)
  // Inform plugins that their window's frame has changed.
  std::set<WebPluginDelegateProxy*>::iterator plugin_it;
  for (plugin_it = plugin_delegates_.begin();
       plugin_it != plugin_delegates_.end(); ++plugin_it) {
    (*plugin_it)->WindowFrameChanged(window_frame, view_frame);
  }
#endif
}

void RenderViewImpl::OnPluginImeCompositionCompleted(const base::string16& text,
                                                     int plugin_id) {
  // WebPluginDelegateProxy is responsible for figuring out if this event
  // applies to it or not, so inform all the delegates.
  std::set<WebPluginDelegateProxy*>::iterator plugin_it;
  for (plugin_it = plugin_delegates_.begin();
       plugin_it != plugin_delegates_.end(); ++plugin_it) {
    (*plugin_it)->ImeCompositionCompleted(text, plugin_id);
  }
}
#endif  // OS_MACOSX

void RenderViewImpl::Close() {
  // We need to grab a pointer to the doomed WebView before we destroy it.
  WebView* doomed = webview();
  RenderWidget::Close();
  g_view_map.Get().erase(doomed);
  g_routing_id_view_map.Get().erase(routing_id_);
}

void RenderViewImpl::DidHandleKeyEvent() {
  ClearEditCommands();
}

bool RenderViewImpl::WillHandleMouseEvent(const blink::WebMouseEvent& event) {
  context_menu_source_type_ = ui::MENU_SOURCE_MOUSE;
  possible_drag_event_info_.event_source =
      ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE;
  possible_drag_event_info_.event_location =
      gfx::Point(event.globalX, event.globalY);

#if defined(ENABLE_PLUGINS)
  main_render_frame_->WillHandleMouseEvent(event);
#endif

  // If the mouse is locked, only the current owner of the mouse lock can
  // process mouse events.
  return mouse_lock_dispatcher_->WillHandleMouseEvent(event);
}

bool RenderViewImpl::WillHandleKeyEvent(const blink::WebKeyboardEvent& event) {
  context_menu_source_type_ = ui::MENU_SOURCE_KEYBOARD;
  return false;
}

bool RenderViewImpl::WillHandleGestureEvent(
    const blink::WebGestureEvent& event) {
  context_menu_source_type_ = ui::MENU_SOURCE_TOUCH;
  possible_drag_event_info_.event_source =
      ui::DragDropTypes::DRAG_EVENT_SOURCE_TOUCH;
  possible_drag_event_info_.event_location =
      gfx::Point(event.globalX, event.globalY);
  return false;
}

void RenderViewImpl::DidHandleMouseEvent(const WebMouseEvent& event) {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidHandleMouseEvent(event));
}

void RenderViewImpl::DidHandleTouchEvent(const WebTouchEvent& event) {
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidHandleTouchEvent(event));
}

bool RenderViewImpl::HasTouchEventHandlersAt(const gfx::Point& point) const {
  if (!webview())
    return false;
  return webview()->hasTouchEventHandlersAt(point);
}

void RenderViewImpl::OnWasHidden() {
  RenderWidget::OnWasHidden();

#if defined(OS_ANDROID) && defined(ENABLE_WEBRTC)
  RenderThreadImpl::current()->video_capture_impl_manager()->
      SuspendDevices(true);
#endif

  if (webview())
    webview()->setVisibilityState(visibilityState(), false);

#if defined(ENABLE_PLUGINS)
  main_render_frame_->PageVisibilityChanged(false);

#if defined(OS_MACOSX)
  // Inform NPAPI plugins that their container is no longer visible.
  std::set<WebPluginDelegateProxy*>::iterator plugin_it;
  for (plugin_it = plugin_delegates_.begin();
       plugin_it != plugin_delegates_.end(); ++plugin_it) {
    (*plugin_it)->SetContainerVisibility(false);
  }
#endif  // OS_MACOSX
#endif // ENABLE_PLUGINS
}

void RenderViewImpl::OnWasShown(bool needs_repainting) {
  RenderWidget::OnWasShown(needs_repainting);

#if defined(OS_ANDROID) && defined(ENABLE_WEBRTC)
  RenderThreadImpl::current()->video_capture_impl_manager()->
      SuspendDevices(false);
#endif

  if (webview())
    webview()->setVisibilityState(visibilityState(), false);

#if defined(ENABLE_PLUGINS)
  main_render_frame_->PageVisibilityChanged(true);

#if defined(OS_MACOSX)
  // Inform NPAPI plugins that their container is now visible.
  std::set<WebPluginDelegateProxy*>::iterator plugin_it;
  for (plugin_it = plugin_delegates_.begin();
       plugin_it != plugin_delegates_.end(); ++plugin_it) {
    (*plugin_it)->SetContainerVisibility(true);
  }
#endif  // OS_MACOSX
#endif  // ENABLE_PLUGINS
}

GURL RenderViewImpl::GetURLForGraphicsContext3D() {
  DCHECK(webview());
  if (webview()->mainFrame())
    return GURL(webview()->mainFrame()->document().url());
  else
    return GURL("chrome://gpu/RenderViewImpl::CreateGraphicsContext3D");
}

bool RenderViewImpl::ForceCompositingModeEnabled() {
  return webkit_preferences_.force_compositing_mode;
}

void RenderViewImpl::OnSetFocus(bool enable) {
  RenderWidget::OnSetFocus(enable);

#if defined(ENABLE_PLUGINS)
  if (webview() && webview()->isActive()) {
    // Notify all NPAPI plugins.
    std::set<WebPluginDelegateProxy*>::iterator plugin_it;
    for (plugin_it = plugin_delegates_.begin();
         plugin_it != plugin_delegates_.end(); ++plugin_it) {
#if defined(OS_MACOSX)
      // RenderWidget's call to setFocus can cause the underlying webview's
      // activation state to change just like a call to setIsActive.
      if (enable)
        (*plugin_it)->SetWindowFocus(true);
#endif
      (*plugin_it)->SetContentAreaFocus(enable);
    }
  }
  main_render_frame_->OnSetFocus(enable);
#endif
  // Notify all BrowserPlugins of the RenderView's focus state.
  if (browser_plugin_manager_.get())
    browser_plugin_manager_->UpdateFocusState();
}

void RenderViewImpl::OnImeSetComposition(
    const base::string16& text,
    const std::vector<blink::WebCompositionUnderline>& underlines,
    int selection_start,
    int selection_end) {
#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_) {
    focused_pepper_plugin_->render_frame()->OnImeSetComposition(
        text, underlines, selection_start, selection_end);
    return;
  }

#if defined(OS_WIN)
  // When a plug-in has focus, we create platform-specific IME data used by
  // our IME emulator and send it directly to the focused plug-in, i.e. we
  // bypass WebKit. (WebPluginDelegate dispatches this IME data only when its
  // instance ID is the same one as the specified ID.)
  if (focused_plugin_id_ >= 0) {
    std::vector<int> clauses;
    std::vector<int> target;
    for (size_t i = 0; i < underlines.size(); ++i) {
      clauses.push_back(underlines[i].startOffset);
      clauses.push_back(underlines[i].endOffset);
      if (underlines[i].thick) {
        target.clear();
        target.push_back(underlines[i].startOffset);
        target.push_back(underlines[i].endOffset);
      }
    }
    std::set<WebPluginDelegateProxy*>::iterator it;
    for (it = plugin_delegates_.begin(); it != plugin_delegates_.end(); ++it) {
      (*it)->ImeCompositionUpdated(text, clauses, target, selection_end,
                                   focused_plugin_id_);
    }
    return;
  }
#endif  // OS_WIN
#endif  // ENABLE_PLUGINS
  RenderWidget::OnImeSetComposition(text,
                                    underlines,
                                    selection_start,
                                    selection_end);
}

void RenderViewImpl::OnImeConfirmComposition(
    const base::string16& text,
    const gfx::Range& replacement_range,
    bool keep_selection) {
#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_) {
    focused_pepper_plugin_->render_frame()->OnImeConfirmComposition(
        text, replacement_range, keep_selection);
    return;
  }
#if defined(OS_WIN)
  // Same as OnImeSetComposition(), we send the text from IMEs directly to
  // plug-ins. When we send IME text directly to plug-ins, we should not send
  // it to WebKit to prevent WebKit from controlling IMEs.
  // TODO(thakis): Honor |replacement_range| for plugins?
  if (focused_plugin_id_ >= 0) {
    std::set<WebPluginDelegateProxy*>::iterator it;
    for (it = plugin_delegates_.begin();
          it != plugin_delegates_.end(); ++it) {
      (*it)->ImeCompositionCompleted(text, focused_plugin_id_);
    }
    return;
  }
#endif  // OS_WIN
#endif  // ENABLE_PLUGINS
  if (replacement_range.IsValid() && webview()) {
    // Select the text in |replacement_range|, it will then be replaced by
    // text added by the call to RenderWidget::OnImeConfirmComposition().
    if (WebFrame* frame = webview()->focusedFrame()) {
      WebRange webrange = WebRange::fromDocumentRange(
          frame, replacement_range.start(), replacement_range.length());
      if (!webrange.isNull())
        frame->selectRange(webrange);
    }
  }
  RenderWidget::OnImeConfirmComposition(text,
                                        replacement_range,
                                        keep_selection);
}

void RenderViewImpl::SetDeviceScaleFactor(float device_scale_factor) {
  RenderWidget::SetDeviceScaleFactor(device_scale_factor);
  if (webview()) {
    webview()->setDeviceScaleFactor(device_scale_factor);
    webview()->settings()->setAcceleratedCompositingForFixedPositionEnabled(
        ShouldUseFixedPositionCompositing(device_scale_factor_));
  webview()->settings()->setAcceleratedCompositingForOverflowScrollEnabled(
      ShouldUseAcceleratedCompositingForOverflowScroll(device_scale_factor_));
    webview()->settings()->setAcceleratedCompositingForTransitionEnabled(
        ShouldUseTransitionCompositing(device_scale_factor_));
    webview()->settings()->
        setAcceleratedCompositingForFixedRootBackgroundEnabled(
            ShouldUseAcceleratedFixedRootBackground(device_scale_factor_));
    webview()->settings()->setAcceleratedCompositingForScrollableFramesEnabled(
        ShouldUseAcceleratedCompositingForScrollableFrames(
            device_scale_factor_));
    webview()->settings()->setCompositedScrollingForFramesEnabled(
        ShouldUseCompositedScrollingForFrames(device_scale_factor_));
  }
  if (auto_resize_mode_)
    AutoResizeCompositor();

  if (browser_plugin_manager_.get())
    browser_plugin_manager_->UpdateDeviceScaleFactor(device_scale_factor_);
}

ui::TextInputType RenderViewImpl::GetTextInputType() {
#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_)
    return focused_pepper_plugin_->text_input_type();
#endif
  return RenderWidget::GetTextInputType();
}

void RenderViewImpl::GetSelectionBounds(gfx::Rect* start, gfx::Rect* end) {
#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_) {
    // TODO(kinaba) http://crbug.com/101101
    // Current Pepper IME API does not handle selection bounds. So we simply
    // use the caret position as an empty range for now. It will be updated
    // after Pepper API equips features related to surrounding text retrieval.
    gfx::Rect caret = focused_pepper_plugin_->GetCaretBounds();
    *start = caret;
    *end = caret;
    return;
  }
#endif
  RenderWidget::GetSelectionBounds(start, end);
}

#if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
void RenderViewImpl::GetCompositionCharacterBounds(
    std::vector<gfx::Rect>* bounds) {
  DCHECK(bounds);
  bounds->clear();

#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_) {
    return;
  }
#endif

  if (!webview())
    return;
  size_t start_offset = 0;
  size_t character_count = 0;
  if (!webview()->compositionRange(&start_offset, &character_count))
    return;
  if (character_count == 0)
    return;

  blink::WebFrame* frame = webview()->focusedFrame();
  if (!frame)
    return;

  bounds->reserve(character_count);
  blink::WebRect webrect;
  for (size_t i = 0; i < character_count; ++i) {
    if (!frame->firstRectForCharacterRange(start_offset + i, 1, webrect)) {
      DLOG(ERROR) << "Could not retrieve character rectangle at " << i;
      bounds->clear();
      return;
    }
    bounds->push_back(webrect);
  }
}

void RenderViewImpl::GetCompositionRange(gfx::Range* range) {
#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_) {
    return;
  }
#endif
  RenderWidget::GetCompositionRange(range);
}
#endif

bool RenderViewImpl::CanComposeInline() {
#if defined(ENABLE_PLUGINS)
  if (focused_pepper_plugin_)
    return focused_pepper_plugin_->IsPluginAcceptingCompositionEvents();
#endif
  return true;
}

void RenderViewImpl::InstrumentWillBeginFrame(int frame_id) {
  if (!webview())
    return;
  if (!webview()->devToolsAgent())
    return;
  webview()->devToolsAgent()->didBeginFrame(frame_id);
}

void RenderViewImpl::InstrumentDidBeginFrame() {
  if (!webview())
    return;
  if (!webview()->devToolsAgent())
    return;
  // TODO(jamesr/caseq): Decide if this needs to be renamed.
  webview()->devToolsAgent()->didComposite();
}

void RenderViewImpl::InstrumentDidCancelFrame() {
  if (!webview())
    return;
  if (!webview()->devToolsAgent())
    return;
  webview()->devToolsAgent()->didCancelFrame();
}

void RenderViewImpl::InstrumentWillComposite() {
  if (!webview())
    return;
  if (!webview()->devToolsAgent())
    return;
  webview()->devToolsAgent()->willComposite();
}

bool RenderViewImpl::AllowPartialSwap() const {
  return allow_partial_swap_;
}

void RenderViewImpl::SetScreenMetricsEmulationParameters(
    float device_scale_factor,
    const gfx::Point& root_layer_offset,
    float root_layer_scale) {
  if (webview()) {
    webview()->setCompositorDeviceScaleFactorOverride(device_scale_factor);
    webview()->setRootLayerTransform(
        blink::WebSize(root_layer_offset.x(), root_layer_offset.y()),
        root_layer_scale);
  }
}

bool RenderViewImpl::ScheduleFileChooser(
    const FileChooserParams& params,
    WebFileChooserCompletion* completion) {
  static const size_t kMaximumPendingFileChooseRequests = 4;
  if (file_chooser_completions_.size() > kMaximumPendingFileChooseRequests) {
    // This sanity check prevents too many file choose requests from getting
    // queued which could DoS the user. Getting these is most likely a
    // programming error (there are many ways to DoS the user so it's not
    // considered a "real" security check), either in JS requesting many file
    // choosers to pop up, or in a plugin.
    //
    // TODO(brettw) we might possibly want to require a user gesture to open
    // a file picker, which will address this issue in a better way.
    return false;
  }

  file_chooser_completions_.push_back(linked_ptr<PendingFileChooser>(
      new PendingFileChooser(params, completion)));
  if (file_chooser_completions_.size() == 1) {
    // Actually show the browse dialog when this is the first request.
    Send(new ViewHostMsg_RunFileChooser(routing_id_, params));
  }
  return true;
}

blink::WebGeolocationClient* RenderViewImpl::geolocationClient() {
  if (!geolocation_dispatcher_)
    geolocation_dispatcher_ = new GeolocationDispatcher(this);
  return geolocation_dispatcher_;
}

blink::WebSpeechInputController* RenderViewImpl::speechInputController(
    blink::WebSpeechInputListener* listener) {
#if defined(ENABLE_INPUT_SPEECH)
  if (!input_tag_speech_dispatcher_)
    input_tag_speech_dispatcher_ =
        new InputTagSpeechDispatcher(this, listener);
#endif
  return input_tag_speech_dispatcher_;
}

blink::WebSpeechRecognizer* RenderViewImpl::speechRecognizer() {
  if (!speech_recognition_dispatcher_)
    speech_recognition_dispatcher_ = new SpeechRecognitionDispatcher(this);
  return speech_recognition_dispatcher_;
}

void RenderViewImpl::zoomLimitsChanged(double minimum_level,
                                       double maximum_level) {
  // For now, don't remember plugin zoom values.  We don't want to mix them with
  // normal web content (i.e. a fixed layout plugin would usually want them
  // different).
  bool remember = !webview()->mainFrame()->document().isPluginDocument();

  int minimum_percent = static_cast<int>(
      ZoomLevelToZoomFactor(minimum_level) * 100);
  int maximum_percent = static_cast<int>(
      ZoomLevelToZoomFactor(maximum_level) * 100);

  Send(new ViewHostMsg_UpdateZoomLimits(
      routing_id_, minimum_percent, maximum_percent, remember));
}

void RenderViewImpl::zoomLevelChanged() {
  bool remember = !webview()->mainFrame()->document().isPluginDocument();
  float zoom_level = webview()->zoomLevel();

  FOR_EACH_OBSERVER(RenderViewObserver, observers_, ZoomLevelChanged());

  // Tell the browser which url got zoomed so it can update the menu and the
  // saved values if necessary
  Send(new ViewHostMsg_DidZoomURL(
      routing_id_, zoom_level, remember,
      GURL(webview()->mainFrame()->document().url())));
}

double RenderViewImpl::zoomLevelToZoomFactor(double zoom_level) const {
  return ZoomLevelToZoomFactor(zoom_level);
}

double RenderViewImpl::zoomFactorToZoomLevel(double factor) const {
  return ZoomFactorToZoomLevel(factor);
}

void RenderViewImpl::registerProtocolHandler(const WebString& scheme,
                                             const WebString& base_url,
                                             const WebString& url,
                                             const WebString& title) {
  bool user_gesture = WebUserGestureIndicator::isProcessingUserGesture();
  GURL base(base_url);
  GURL absolute_url = base.Resolve(UTF16ToUTF8(url));
  if (base.GetOrigin() != absolute_url.GetOrigin()) {
    return;
  }
  Send(new ViewHostMsg_RegisterProtocolHandler(routing_id_,
                                               UTF16ToUTF8(scheme),
                                               absolute_url,
                                               title,
                                               user_gesture));
}

blink::WebPageVisibilityState RenderViewImpl::visibilityState() const {
  blink::WebPageVisibilityState current_state = is_hidden() ?
      blink::WebPageVisibilityStateHidden :
      blink::WebPageVisibilityStateVisible;
  blink::WebPageVisibilityState override_state = current_state;
  // TODO(jam): move this method to WebFrameClient.
  if (GetContentClient()->renderer()->
          ShouldOverridePageVisibilityState(main_render_frame_.get(),
                                            &override_state))
    return override_state;
  return current_state;
}

blink::WebUserMediaClient* RenderViewImpl::userMediaClient() {
  // This can happen in tests, in which case it's OK to return NULL.
  if (!InitializeMediaStreamClient())
    return NULL;

  return web_user_media_client_;
}

blink::WebMIDIClient* RenderViewImpl::webMIDIClient() {
  if (!midi_dispatcher_)
    midi_dispatcher_ = new MIDIDispatcher(this);
  return midi_dispatcher_;
}

void RenderViewImpl::draggableRegionsChanged() {
  FOR_EACH_OBSERVER(
      RenderViewObserver,
      observers_,
      DraggableRegionsChanged(webview()->mainFrame()));
}

WebMediaPlayer* RenderViewImpl::CreateWebMediaPlayerForMediaStream(
    WebFrame* frame,
    const blink::WebURL& url,
    WebMediaPlayerClient* client) {
#if defined(ENABLE_WEBRTC)
  if (!InitializeMediaStreamClient()) {
    LOG(ERROR) << "Failed to initialize MediaStreamClient";
    return NULL;
  }
#if !defined(GOOGLE_TV)
  if (media_stream_client_->IsMediaStream(url)) {
#if defined(OS_ANDROID) && defined(ARCH_CPU_ARMEL)
    bool found_neon =
        (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
    UMA_HISTOGRAM_BOOLEAN("Platform.WebRtcNEONFound", found_neon);
#endif  // defined(OS_ANDROID) && defined(ARCH_CPU_ARMEL)
    return new WebMediaPlayerMS(frame, client, AsWeakPtr(),
                                media_stream_client_, new RenderMediaLog());
  }
#endif  // !defined(GOOGLE_TV)
#endif  // defined(ENABLE_WEBRTC)
  return NULL;
}

#if defined(OS_ANDROID)
WebContentDetectionResult RenderViewImpl::detectContentAround(
    const WebHitTestResult& touch_hit) {
  DCHECK(!touch_hit.isNull());
  DCHECK(!touch_hit.node().isNull());
  DCHECK(touch_hit.node().isTextNode());

  // Process the position with all the registered content detectors until
  // a match is found. Priority is provided by their relative order.
  for (ContentDetectorList::const_iterator it = content_detectors_.begin();
      it != content_detectors_.end(); ++it) {
    ContentDetector::Result content = (*it)->FindTappedContent(touch_hit);
    if (content.valid) {
      return WebContentDetectionResult(content.content_boundaries,
          UTF8ToUTF16(content.text), content.intent_url);
    }
  }
  return WebContentDetectionResult();
}

void RenderViewImpl::scheduleContentIntent(const WebURL& intent) {
  // Introduce a short delay so that the user can notice the content.
  base::MessageLoop::current()->PostDelayedTask(
      FROM_HERE,
      base::Bind(&RenderViewImpl::LaunchAndroidContentIntent,
                 AsWeakPtr(),
                 intent,
                 expected_content_intent_id_),
      base::TimeDelta::FromMilliseconds(kContentIntentDelayMilliseconds));
}

void RenderViewImpl::cancelScheduledContentIntents() {
  ++expected_content_intent_id_;
}

void RenderViewImpl::LaunchAndroidContentIntent(const GURL& intent,
                                                size_t request_id) {
  if (request_id != expected_content_intent_id_)
      return;

  // Remove the content highlighting if any.
  scheduleComposite();

  if (!intent.is_empty())
    Send(new ViewHostMsg_StartContentIntent(routing_id_, intent));
}

bool RenderViewImpl::openDateTimeChooser(
    const blink::WebDateTimeChooserParams& params,
    blink::WebDateTimeChooserCompletion* completion) {
  // JavaScript may try to open a date time chooser while one is already open.
  if (date_time_picker_client_)
    return false;
  date_time_picker_client_.reset(
      new RendererDateTimePicker(this, params, completion));
  return date_time_picker_client_->Open();
}

#if defined(OS_ANDROID)
void RenderViewImpl::DismissDateTimeDialog() {
  DCHECK(date_time_picker_client_);
  date_time_picker_client_.reset(NULL);
}
#endif

WebMediaPlayer* RenderViewImpl::CreateAndroidWebMediaPlayer(
      WebFrame* frame,
      const blink::WebURL& url,
      WebMediaPlayerClient* client) {
  GpuChannelHost* gpu_channel_host =
      RenderThreadImpl::current()->EstablishGpuChannelSync(
          CAUSE_FOR_GPU_LAUNCH_VIDEODECODEACCELERATOR_INITIALIZE);
  if (!gpu_channel_host) {
    LOG(ERROR) << "Failed to establish GPU channel for media player";
    return NULL;
  }

  scoped_ptr<StreamTextureFactory> stream_texture_factory;
  if (UsingSynchronousRendererCompositor()) {
    SynchronousCompositorFactory* factory =
        SynchronousCompositorFactory::GetInstance();
    stream_texture_factory = factory->CreateStreamTextureFactory(routing_id_);
  } else {
    scoped_refptr<cc::ContextProvider> context_provider =
        RenderThreadImpl::current()->SharedMainThreadContextProvider();

    if (!context_provider.get()) {
      LOG(ERROR) << "Failed to get context3d for media player";
      return NULL;
    }

    stream_texture_factory.reset(new StreamTextureFactoryImpl(
        context_provider->Context3d(), gpu_channel_host, routing_id_));
  }

  scoped_ptr<WebMediaPlayerAndroid> web_media_player_android(
      new WebMediaPlayerAndroid(
          frame,
          client,
          AsWeakPtr(),
          media_player_manager_,
          stream_texture_factory.release(),
          RenderThreadImpl::current()->GetMediaThreadMessageLoopProxy(),
          new RenderMediaLog()));
#if defined(ENABLE_WEBRTC) && defined(GOOGLE_TV)
  if (media_stream_client_ && media_stream_client_->IsMediaStream(url)) {
    RTCVideoDecoderFactoryTv* factory = RenderThreadImpl::current()
        ->GetMediaStreamDependencyFactory()->decoder_factory_tv();
    // |media_stream_client| and |factory| outlives |web_media_player_android|.
    if (!factory->AcquireDemuxer() ||
        !web_media_player_android->InjectMediaStream(
            media_stream_client_,
            factory,
            base::Bind(
                base::IgnoreResult(&RTCVideoDecoderFactoryTv::ReleaseDemuxer),
                base::Unretained(factory)))) {
      LOG(ERROR) << "Failed to inject media stream.";
      return NULL;
    }
  }
#endif  // defined(ENABLE_WEBRTC) && defined(GOOGLE_TV)
  return web_media_player_android.release();
}

#endif  // defined(OS_ANDROID)

#if defined(OS_MACOSX)
void RenderViewImpl::OnSelectPopupMenuItem(int selected_index) {
  if (external_popup_menu_ == NULL) {
    // Crash reports from the field indicate that we can be notified with a
    // NULL external popup menu (we probably get notified twice).
    // If you hit this please file a bug against jcivelli and include the page
    // and steps to repro.
    NOTREACHED();
    return;
  }
  external_popup_menu_->DidSelectItem(selected_index);
  external_popup_menu_.reset();
}
#endif

#if defined(OS_ANDROID)
void RenderViewImpl::OnSelectPopupMenuItems(
    bool canceled,
    const std::vector<int>& selected_indices) {
  // It is possible to receive more than one of these calls if the user presses
  // a select faster than it takes for the show-select-popup IPC message to make
  // it to the browser UI thread.  Ignore the extra-messages.
  // TODO(jcivelli): http:/b/5793321 Implement a better fix, as detailed in bug.
  if (!external_popup_menu_)
    return;

  external_popup_menu_->DidSelectItems(canceled, selected_indices);
  external_popup_menu_.reset();
}
#endif

void RenderViewImpl::OnContextMenuClosed(
    const CustomContextMenuContext& custom_context) {
  if (custom_context.request_id) {
    // External request, should be in our map.
    ContextMenuClient* client =
        pending_context_menus_.Lookup(custom_context.request_id);
    if (client) {
      client->OnMenuClosed(custom_context.request_id);
      pending_context_menus_.Remove(custom_context.request_id);
    }
  } else {
    // Internal request, forward to WebKit.
    context_menu_node_.reset();
  }
}

void RenderViewImpl::OnShowContextMenu(const gfx::Point& location) {
  context_menu_source_type_ = ui::MENU_SOURCE_TOUCH_EDIT_MENU;
  touch_editing_context_menu_location_ = location;
  if (webview())
    webview()->showContextMenu();
}

void RenderViewImpl::OnEnableViewSourceMode() {
  if (!webview())
    return;
  WebFrame* main_frame = webview()->mainFrame();
  if (!main_frame)
    return;
  main_frame->enableViewSourceMode(true);
}

void RenderViewImpl::OnDisownOpener() {
  if (!webview())
    return;

  WebFrame* main_frame = webview()->mainFrame();
  if (main_frame && main_frame->opener())
    main_frame->setOpener(NULL);
}

#if defined(OS_ANDROID)
bool RenderViewImpl::didTapMultipleTargets(
    const blink::WebGestureEvent& event,
    const WebVector<WebRect>& target_rects) {
  // Never show a disambiguation popup when accessibility is enabled,
  // as this interferes with "touch exploration".
  if (accessibility_mode_ == AccessibilityModeComplete)
    return false;

  gfx::Rect finger_rect(
      event.x - event.data.tap.width / 2, event.y - event.data.tap.height / 2,
      event.data.tap.width, event.data.tap.height);
  gfx::Rect zoom_rect;
  float new_total_scale =
      DisambiguationPopupHelper::ComputeZoomAreaAndScaleFactor(
          finger_rect, target_rects, GetSize(),
          gfx::Rect(webview()->mainFrame()->visibleContentRect()).size(),
          device_scale_factor_ * webview()->pageScaleFactor(), &zoom_rect);
  if (!new_total_scale)
    return false;

  bool handled = false;
  switch (renderer_preferences_.tap_multiple_targets_strategy) {
    case TAP_MULTIPLE_TARGETS_STRATEGY_ZOOM:
      handled = webview()->zoomToMultipleTargetsRect(zoom_rect);
      break;
    case TAP_MULTIPLE_TARGETS_STRATEGY_POPUP: {
      gfx::Size canvas_size =
          gfx::ToCeiledSize(gfx::ScaleSize(zoom_rect.size(), new_total_scale));
      TransportDIB* transport_dib = NULL;
      {
        scoped_ptr<skia::PlatformCanvas> canvas(
            RenderProcess::current()->GetDrawingCanvas(&transport_dib,
                                                       gfx::Rect(canvas_size)));
        if (!canvas) {
          handled = false;
          break;
        }

        // TODO(trchen): Cleanup the device scale factor mess.
        // device scale will be applied in WebKit
        // --> zoom_rect doesn't include device scale,
        //     but WebKit will still draw on zoom_rect * device_scale_factor_
        canvas->scale(new_total_scale / device_scale_factor_,
                      new_total_scale / device_scale_factor_);
        canvas->translate(-zoom_rect.x() * device_scale_factor_,
                          -zoom_rect.y() * device_scale_factor_);

        webwidget_->paint(
            canvas.get(),
            zoom_rect,
            WebWidget::ForceSoftwareRenderingAndIgnoreGPUResidentContent);
      }

      gfx::Rect physical_window_zoom_rect = gfx::ToEnclosingRect(
          ClientRectToPhysicalWindowRect(gfx::RectF(zoom_rect)));
      Send(new ViewHostMsg_ShowDisambiguationPopup(routing_id_,
                                                   physical_window_zoom_rect,
                                                   canvas_size,
                                                   transport_dib->id()));
      handled = true;
      break;
    }
    case TAP_MULTIPLE_TARGETS_STRATEGY_NONE:
      // No-op.
      break;
  }

  return handled;
}
#endif

unsigned RenderViewImpl::GetLocalSessionHistoryLengthForTesting() const {
  return history_list_length_;
}

void RenderViewImpl::SetFocusAndActivateForTesting(bool enable) {
  if (enable) {
    if (has_focus())
      return;
    OnSetActive(true);
    OnSetFocus(true);
  } else {
    if (!has_focus())
      return;
    OnSetFocus(false);
    OnSetActive(false);
  }
}

void RenderViewImpl::SetDeviceScaleFactorForTesting(float factor) {
  ViewMsg_Resize_Params params;
  params.screen_info = screen_info_;
  params.screen_info.deviceScaleFactor = factor;
  params.new_size = size();
  params.physical_backing_size =
      gfx::ToCeiledSize(gfx::ScaleSize(size(), factor));
  params.overdraw_bottom_height = 0.f;
  params.resizer_rect = WebRect();
  params.is_fullscreen = is_fullscreen();
  OnResize(params);
}

void RenderViewImpl::ForceResizeForTesting(const gfx::Size& new_size) {
  gfx::Rect new_position(rootWindowRect().x,
                         rootWindowRect().y,
                         new_size.width(),
                         new_size.height());
  ResizeSynchronously(new_position);
}

void RenderViewImpl::UseSynchronousResizeModeForTesting(bool enable) {
  resizing_mode_selector_->set_is_synchronous_mode(enable);
}

void RenderViewImpl::EnableAutoResizeForTesting(const gfx::Size& min_size,
                                                const gfx::Size& max_size) {
  OnEnableAutoResize(min_size, max_size);
}

void RenderViewImpl::DisableAutoResizeForTesting(const gfx::Size& new_size) {
  OnDisableAutoResize(new_size);
}

void RenderViewImpl::SetMediaStreamClientForTesting(
    MediaStreamClient* media_stream_client) {
  DCHECK(!media_stream_client_);
  DCHECK(!web_user_media_client_);
  media_stream_client_ = media_stream_client;
}

void RenderViewImpl::OnReleaseDisambiguationPopupDIB(
    TransportDIB::Handle dib_handle) {
  TransportDIB* dib = TransportDIB::CreateWithHandle(dib_handle);
  RenderProcess::current()->ReleaseTransportDIB(dib);
}

void RenderViewImpl::DidCommitCompositorFrame() {
  RenderWidget::DidCommitCompositorFrame();
  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidCommitCompositorFrame());
}

void RenderViewImpl::SendUpdateFaviconURL(const std::vector<FaviconURL>& urls) {
  if (!urls.empty())
    Send(new ViewHostMsg_UpdateFaviconURL(routing_id_, page_id_, urls));
}

void RenderViewImpl::DidStopLoadingIcons() {
  int icon_types = WebIconURL::TypeFavicon;
  if (TouchEnabled())
    icon_types |= WebIconURL::TypeTouchPrecomposed | WebIconURL::TypeTouch;

  WebVector<WebIconURL> icon_urls =
      webview()->mainFrame()->iconURLs(icon_types);

  std::vector<FaviconURL> urls;
  for (size_t i = 0; i < icon_urls.size(); i++) {
    WebURL url = icon_urls[i].iconURL();
    if (!url.isEmpty())
      urls.push_back(FaviconURL(url,
                                ToFaviconType(icon_urls[i].iconType())));
  }
  SendUpdateFaviconURL(urls);
}

GURL RenderViewImpl::GetOriginalRequestURL(WebDataSource* ds) {
  // WebDataSource has unreachable URL means that the frame is loaded through
  // blink::WebFrame::loadData(), and the base URL will be in the redirect
  // chain. However, we never visited the baseURL. So in this case, we should
  // use the unreachable URL as the original URL.
  if (ds->hasUnreachableURL())
    return ds->unreachableURL();

  std::vector<GURL> redirects;
  GetRedirectChain(ds, &redirects);
  if (!redirects.empty())
    return redirects.at(0);

  return ds->originalRequest().url();
}

}  // namespace content