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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
      6 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
      7 
      8 #include <set>
      9 #include <string>
     10 #include <vector>
     11 
     12 #include "base/memory/memory_pressure_listener.h"
     13 #include "base/metrics/user_metrics_action.h"
     14 #include "base/observer_list.h"
     15 #include "base/strings/string16.h"
     16 #include "base/threading/thread_checker.h"
     17 #include "base/timer/timer.h"
     18 #include "build/build_config.h"
     19 #include "content/child/child_thread.h"
     20 #include "content/common/content_export.h"
     21 #include "content/common/gpu/client/gpu_channel_host.h"
     22 #include "content/common/gpu/gpu_result_codes.h"
     23 #include "content/public/renderer/render_thread.h"
     24 #include "net/base/network_change_notifier.h"
     25 #include "third_party/WebKit/public/platform/WebConnectionType.h"
     26 #include "ui/gfx/native_widget_types.h"
     27 
     28 #if defined(OS_MACOSX)
     29 #include "third_party/WebKit/public/web/mac/WebScrollbarTheme.h"
     30 #endif
     31 
     32 class GrContext;
     33 class SkBitmap;
     34 struct ViewMsg_New_Params;
     35 struct WorkerProcessMsg_CreateWorker_Params;
     36 
     37 namespace blink {
     38 class WebGamepads;
     39 class WebGraphicsContext3D;
     40 class WebMediaStreamCenter;
     41 class WebMediaStreamCenterClient;
     42 }
     43 
     44 namespace base {
     45 class MessageLoopProxy;
     46 class SingleThreadTaskRunner;
     47 class Thread;
     48 }
     49 
     50 namespace cc {
     51 class ContextProvider;
     52 }
     53 
     54 namespace IPC {
     55 class ForwardingMessageFilter;
     56 class MessageFilter;
     57 }
     58 
     59 namespace media {
     60 class AudioHardwareConfig;
     61 class GpuVideoAcceleratorFactories;
     62 }
     63 
     64 namespace v8 {
     65 class Extension;
     66 }
     67 
     68 namespace webkit {
     69 namespace gpu {
     70 class ContextProviderWebContext;
     71 class GrContextForWebGraphicsContext3D;
     72 }
     73 }
     74 
     75 namespace content {
     76 
     77 class AppCacheDispatcher;
     78 class AecDumpMessageFilter;
     79 class AudioInputMessageFilter;
     80 class AudioMessageFilter;
     81 class AudioRendererMixerManager;
     82 class ContextProviderCommandBuffer;
     83 class DBMessageFilter;
     84 class DevToolsAgentFilter;
     85 class DomStorageDispatcher;
     86 class EmbeddedWorkerDispatcher;
     87 class GpuChannelHost;
     88 class IndexedDBDispatcher;
     89 class InputEventFilter;
     90 class InputHandlerManager;
     91 class MediaStreamCenter;
     92 class MemoryObserver;
     93 class PeerConnectionDependencyFactory;
     94 class MidiMessageFilter;
     95 class NetInfoDispatcher;
     96 class P2PSocketDispatcher;
     97 class PeerConnectionTracker;
     98 class RendererDemuxerAndroid;
     99 class RendererWebKitPlatformSupportImpl;
    100 class RenderProcessObserver;
    101 class VideoCaptureImplManager;
    102 class WebGraphicsContext3DCommandBufferImpl;
    103 class WebRTCIdentityService;
    104 
    105 // The RenderThreadImpl class represents a background thread where RenderView
    106 // instances live.  The RenderThread supports an API that is used by its
    107 // consumer to talk indirectly to the RenderViews and supporting objects.
    108 // Likewise, it provides an API for the RenderViews to talk back to the main
    109 // process (i.e., their corresponding WebContentsImpl).
    110 //
    111 // Most of the communication occurs in the form of IPC messages.  They are
    112 // routed to the RenderThread according to the routing IDs of the messages.
    113 // The routing IDs correspond to RenderView instances.
    114 class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
    115                                         public ChildThread,
    116                                         public GpuChannelHostFactory {
    117  public:
    118   static RenderThreadImpl* current();
    119 
    120   RenderThreadImpl();
    121   // Constructor that's used when running in single process mode.
    122   explicit RenderThreadImpl(const std::string& channel_name);
    123   virtual ~RenderThreadImpl();
    124   virtual void Shutdown() OVERRIDE;
    125 
    126   // When initializing WebKit, ensure that any schemes needed for the content
    127   // module are registered properly.  Static to allow sharing with tests.
    128   static void RegisterSchemes();
    129 
    130   // Notify V8 that the date/time configuration of the system might have
    131   // changed.
    132   static void NotifyTimezoneChange();
    133 
    134   // RenderThread implementation:
    135   virtual bool Send(IPC::Message* msg) OVERRIDE;
    136   virtual base::MessageLoop* GetMessageLoop() OVERRIDE;
    137   virtual IPC::SyncChannel* GetChannel() OVERRIDE;
    138   virtual std::string GetLocale() OVERRIDE;
    139   virtual IPC::SyncMessageFilter* GetSyncMessageFilter() OVERRIDE;
    140   virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy()
    141       OVERRIDE;
    142   virtual void AddRoute(int32 routing_id, IPC::Listener* listener) OVERRIDE;
    143   virtual void RemoveRoute(int32 routing_id) OVERRIDE;
    144   virtual int GenerateRoutingID() OVERRIDE;
    145   virtual void AddFilter(IPC::MessageFilter* filter) OVERRIDE;
    146   virtual void RemoveFilter(IPC::MessageFilter* filter) OVERRIDE;
    147   virtual void AddObserver(RenderProcessObserver* observer) OVERRIDE;
    148   virtual void RemoveObserver(RenderProcessObserver* observer) OVERRIDE;
    149   virtual void SetResourceDispatcherDelegate(
    150       ResourceDispatcherDelegate* delegate) OVERRIDE;
    151   virtual void EnsureWebKitInitialized() OVERRIDE;
    152   virtual void RecordAction(const base::UserMetricsAction& action) OVERRIDE;
    153   virtual void RecordComputedAction(const std::string& action) OVERRIDE;
    154   virtual scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
    155       size_t buffer_size) OVERRIDE;
    156   virtual void RegisterExtension(v8::Extension* extension) OVERRIDE;
    157   virtual void ScheduleIdleHandler(int64 initial_delay_ms) OVERRIDE;
    158   virtual void IdleHandler() OVERRIDE;
    159   virtual int64 GetIdleNotificationDelayInMs() const OVERRIDE;
    160   virtual void SetIdleNotificationDelayInMs(
    161       int64 idle_notification_delay_in_ms) OVERRIDE;
    162   virtual void UpdateHistograms(int sequence_number) OVERRIDE;
    163   virtual int PostTaskToAllWebWorkers(const base::Closure& closure) OVERRIDE;
    164   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) OVERRIDE;
    165   virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
    166 #if defined(OS_WIN)
    167   virtual void PreCacheFont(const LOGFONT& log_font) OVERRIDE;
    168   virtual void ReleaseCachedFonts() OVERRIDE;
    169 #endif
    170   virtual ServiceRegistry* GetServiceRegistry() OVERRIDE;
    171 
    172   // Synchronously establish a channel to the GPU plugin if not previously
    173   // established or if it has been lost (for example if the GPU plugin crashed).
    174   // If there is a pending asynchronous request, it will be completed by the
    175   // time this routine returns.
    176   GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch);
    177 
    178 
    179   // These methods modify how the next message is sent.  Normally, when sending
    180   // a synchronous message that runs a nested message loop, we need to suspend
    181   // callbacks into WebKit.  This involves disabling timers and deferring
    182   // resource loads.  However, there are exceptions when we need to customize
    183   // the behavior.
    184   void DoNotSuspendWebKitSharedTimer();
    185   void DoNotNotifyWebKitOfModalLoop();
    186 
    187   // True if we are running layout tests. This currently disables forwarding
    188   // various status messages to the console, skips network error pages, and
    189   // short circuits size update and focus events.
    190   bool layout_test_mode() const {
    191     return layout_test_mode_;
    192   }
    193   void set_layout_test_mode(bool layout_test_mode) {
    194     layout_test_mode_ = layout_test_mode;
    195   }
    196 
    197   RendererWebKitPlatformSupportImpl* webkit_platform_support() const {
    198     DCHECK(webkit_platform_support_);
    199     return webkit_platform_support_.get();
    200   }
    201 
    202   scoped_refptr<base::SingleThreadTaskRunner>
    203   main_thread_compositor_task_runner() const {
    204     return main_thread_compositor_task_runner_;
    205   }
    206 
    207   IPC::ForwardingMessageFilter* compositor_output_surface_filter() const {
    208     return compositor_output_surface_filter_.get();
    209   }
    210 
    211   InputHandlerManager* input_handler_manager() const {
    212     return input_handler_manager_.get();
    213   }
    214 
    215   // Will be NULL if threaded compositing has not been enabled.
    216   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy() const {
    217     return compositor_message_loop_proxy_;
    218   }
    219 
    220   bool is_gpu_rasterization_enabled() const {
    221     return is_gpu_rasterization_enabled_;
    222   }
    223 
    224   bool is_gpu_rasterization_forced() const {
    225     return is_gpu_rasterization_forced_;
    226   }
    227 
    228   bool is_impl_side_painting_enabled() const {
    229     return is_impl_side_painting_enabled_;
    230   }
    231 
    232   bool is_lcd_text_enabled() const { return is_lcd_text_enabled_; }
    233 
    234   bool is_distance_field_text_enabled() const {
    235     return is_distance_field_text_enabled_;
    236   }
    237 
    238   bool is_zero_copy_enabled() const { return is_zero_copy_enabled_; }
    239 
    240   bool is_one_copy_enabled() const { return is_one_copy_enabled_; }
    241 
    242   AppCacheDispatcher* appcache_dispatcher() const {
    243     return appcache_dispatcher_.get();
    244   }
    245 
    246   DomStorageDispatcher* dom_storage_dispatcher() const {
    247     return dom_storage_dispatcher_.get();
    248   }
    249 
    250   EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
    251     return embedded_worker_dispatcher_.get();
    252   }
    253 
    254   AudioInputMessageFilter* audio_input_message_filter() {
    255     return audio_input_message_filter_.get();
    256   }
    257 
    258   AudioMessageFilter* audio_message_filter() {
    259     return audio_message_filter_.get();
    260   }
    261 
    262   MidiMessageFilter* midi_message_filter() {
    263     return midi_message_filter_.get();
    264   }
    265 
    266 #if defined(OS_ANDROID)
    267   RendererDemuxerAndroid* renderer_demuxer() {
    268     return renderer_demuxer_.get();
    269   }
    270 #endif
    271 
    272   // Creates the embedder implementation of WebMediaStreamCenter.
    273   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
    274   blink::WebMediaStreamCenter* CreateMediaStreamCenter(
    275       blink::WebMediaStreamCenterClient* client);
    276 
    277 #if defined(ENABLE_WEBRTC)
    278   // Returns a factory used for creating RTC PeerConnection objects.
    279   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
    280 
    281   PeerConnectionTracker* peer_connection_tracker() {
    282     return peer_connection_tracker_.get();
    283   }
    284 
    285   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
    286   P2PSocketDispatcher* p2p_socket_dispatcher() {
    287     return p2p_socket_dispatcher_.get();
    288   }
    289 #endif
    290 
    291   VideoCaptureImplManager* video_capture_impl_manager() const {
    292     return vc_manager_.get();
    293   }
    294 
    295   // Get the GPU channel. Returns NULL if the channel is not established or
    296   // has been lost.
    297   GpuChannelHost* GetGpuChannel();
    298 
    299   // Returns a MessageLoopProxy instance corresponding to the message loop
    300   // of the thread on which file operations should be run. Must be called
    301   // on the renderer's main thread.
    302   scoped_refptr<base::MessageLoopProxy> GetFileThreadMessageLoopProxy();
    303 
    304   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
    305   // of the thread on which media operations should be run. Must be called
    306   // on the renderer's main thread.
    307   scoped_refptr<base::SingleThreadTaskRunner> GetMediaThreadTaskRunner();
    308 
    309   // Causes the idle handler to skip sending idle notifications
    310   // on the two next scheduled calls, so idle notifications are
    311   // not sent for at least one notification delay.
    312   void PostponeIdleNotification();
    313 
    314   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
    315 
    316   scoped_refptr<webkit::gpu::ContextProviderWebContext>
    317       SharedMainThreadContextProvider();
    318 
    319   // AudioRendererMixerManager instance which manages renderer side mixer
    320   // instances shared based on configured audio parameters.  Lazily created on
    321   // first call.
    322   AudioRendererMixerManager* GetAudioRendererMixerManager();
    323 
    324   // AudioHardwareConfig contains audio hardware configuration for
    325   // renderer side clients.  Creation requires a synchronous IPC call so it is
    326   // lazily created on the first call.
    327   media::AudioHardwareConfig* GetAudioHardwareConfig();
    328 
    329 #if defined(OS_WIN)
    330   void PreCacheFontCharacters(const LOGFONT& log_font,
    331                               const base::string16& str);
    332 #endif
    333 
    334 #if defined(ENABLE_WEBRTC)
    335   WebRTCIdentityService* get_webrtc_identity_service() {
    336     return webrtc_identity_service_.get();
    337   }
    338 #endif
    339 
    340   // For producing custom V8 histograms. Custom histograms are produced if all
    341   // RenderViews share the same host, and the host is in the pre-specified set
    342   // of hosts we want to produce custom diagrams for. The name for a custom
    343   // diagram is the name of the corresponding generic diagram plus a
    344   // host-specific suffix.
    345   class CONTENT_EXPORT HistogramCustomizer {
    346    public:
    347     HistogramCustomizer();
    348     ~HistogramCustomizer();
    349 
    350     // Called when a top frame of a RenderView navigates. This function updates
    351     // RenderThreadImpl's information about whether all RenderViews are
    352     // displaying a page from the same host. |host| is the host where a
    353     // RenderView navigated, and |view_count| is the number of RenderViews in
    354     // this process.
    355     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
    356 
    357     // Used for customizing some histograms if all RenderViews share the same
    358     // host. Returns the current custom histogram name to use for
    359     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
    360     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
    361 
    362    private:
    363     friend class RenderThreadImplUnittest;
    364 
    365     // Used for updating the information on which is the common host which all
    366     // RenderView's share (if any). If there is no common host, this function is
    367     // called with an empty string.
    368     void SetCommonHost(const std::string& host);
    369 
    370     // The current common host of the RenderViews; empty string if there is no
    371     // common host.
    372     std::string common_host_;
    373     // The corresponding suffix.
    374     std::string common_host_histogram_suffix_;
    375     // Set of histograms for which we want to produce a custom histogram if
    376     // possible.
    377     std::set<std::string> custom_histograms_;
    378 
    379     DISALLOW_COPY_AND_ASSIGN(HistogramCustomizer);
    380   };
    381 
    382   HistogramCustomizer* histogram_customizer() {
    383     return &histogram_customizer_;
    384   }
    385 
    386   // Retrieve current gamepad data.
    387   void SampleGamepads(blink::WebGamepads* data);
    388 
    389   // Called by a RenderWidget when it is created or destroyed. This
    390   // allows the process to know when there are no visible widgets.
    391   void WidgetCreated();
    392   void WidgetDestroyed();
    393   void WidgetHidden();
    394   void WidgetRestored();
    395 
    396   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
    397   void RemoveEmbeddedWorkerRoute(int32 routing_id);
    398 
    399   void RegisterPendingRenderFrameConnect(int routing_id,
    400                                          mojo::ScopedMessagePipeHandle handle);
    401 
    402  private:
    403   // ChildThread
    404   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;
    405 
    406   // GpuChannelHostFactory implementation:
    407   virtual bool IsMainThread() OVERRIDE;
    408   virtual base::MessageLoop* GetMainLoop() OVERRIDE;
    409   virtual scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() OVERRIDE;
    410   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(
    411       size_t size) OVERRIDE;
    412   virtual CreateCommandBufferResult CreateViewCommandBuffer(
    413       int32 surface_id,
    414       const GPUCreateCommandBufferConfig& init_params,
    415       int32 route_id) OVERRIDE;
    416   virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
    417       size_t width,
    418       size_t height,
    419       unsigned internalformat,
    420       unsigned usage) OVERRIDE;
    421 
    422   void Init();
    423 
    424   void OnCreateNewFrame(int routing_id, int parent_routing_id);
    425   void OnCreateNewFrameProxy(int routing_id,
    426                              int parent_routing_id,
    427                              int render_view_routing_id);
    428   void OnSetZoomLevelForCurrentURL(const std::string& scheme,
    429                                    const std::string& host,
    430                                    double zoom_level);
    431   void OnCreateNewView(const ViewMsg_New_Params& params);
    432   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
    433 #if defined(ENABLE_PLUGINS)
    434   void OnPurgePluginListCache(bool reload_pages);
    435 #endif
    436   void OnNetworkTypeChanged(net::NetworkChangeNotifier::ConnectionType type);
    437   void OnGetAccessibilityTree();
    438   void OnTempCrashWithData(const GURL& data);
    439   void OnUpdateTimezone();
    440   void OnMemoryPressure(
    441       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
    442 #if defined(OS_ANDROID)
    443   void OnSetWebKitSharedTimersSuspended(bool suspend);
    444 #endif
    445 #if defined(OS_MACOSX)
    446   void OnUpdateScrollbarTheme(float initial_button_delay,
    447                               float autoscroll_button_delay,
    448                               bool jump_on_track_click,
    449                               blink::ScrollerStyle preferred_scroller_style,
    450                               bool redraw);
    451 #endif
    452   void OnCreateNewSharedWorker(
    453       const WorkerProcessMsg_CreateWorker_Params& params);
    454 
    455   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateOffscreenContext3d();
    456 
    457   // These objects live solely on the render thread.
    458   scoped_ptr<AppCacheDispatcher> appcache_dispatcher_;
    459   scoped_ptr<DomStorageDispatcher> dom_storage_dispatcher_;
    460   scoped_ptr<IndexedDBDispatcher> main_thread_indexed_db_dispatcher_;
    461   scoped_ptr<RendererWebKitPlatformSupportImpl> webkit_platform_support_;
    462   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
    463 
    464   // Used on the render thread and deleted by WebKit at shutdown.
    465   blink::WebMediaStreamCenter* media_stream_center_;
    466 
    467   // Used on the renderer and IPC threads.
    468   scoped_refptr<DBMessageFilter> db_message_filter_;
    469   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
    470   scoped_refptr<AudioMessageFilter> audio_message_filter_;
    471   scoped_refptr<MidiMessageFilter> midi_message_filter_;
    472 #if defined(OS_ANDROID)
    473   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
    474 #endif
    475   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
    476 
    477 #if defined(ENABLE_WEBRTC)
    478   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
    479 
    480   // This is used to communicate to the browser process the status
    481   // of all the peer connections created in the renderer.
    482   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
    483 
    484   // Dispatches all P2P sockets.
    485   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
    486 #endif
    487 
    488   // Used on the render thread.
    489   scoped_ptr<VideoCaptureImplManager> vc_manager_;
    490 
    491   // Used for communicating registering AEC dump consumers with the browser and
    492   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
    493   // diagnostic audio data for WebRTC stored locally when enabled by the user in
    494   // chrome://webrtc-internals.
    495   scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
    496 
    497   // The count of RenderWidgets running through this thread.
    498   int widget_count_;
    499 
    500   // The count of hidden RenderWidgets running through this thread.
    501   int hidden_widget_count_;
    502 
    503   // The current value of the idle notification timer delay.
    504   int64 idle_notification_delay_in_ms_;
    505 
    506   // The number of idle handler calls that skip sending idle notifications.
    507   int idle_notifications_to_skip_;
    508 
    509   bool suspend_webkit_shared_timer_;
    510   bool notify_webkit_of_modal_loop_;
    511   bool webkit_shared_timer_suspended_;
    512 
    513   // The following flag is used to control layout test specific behavior.
    514   bool layout_test_mode_;
    515 
    516   // Timer that periodically calls IdleHandler.
    517   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
    518 
    519   // The channel from the renderer process to the GPU process.
    520   scoped_refptr<GpuChannelHost> gpu_channel_;
    521 
    522   // Cache of variables that are needed on the compositor thread by
    523   // GpuChannelHostFactory methods.
    524   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
    525 
    526   // A lazily initiated thread on which file operations are run.
    527   scoped_ptr<base::Thread> file_thread_;
    528 
    529   // May be null if overridden by ContentRendererClient.
    530   scoped_ptr<base::Thread> compositor_thread_;
    531 
    532   // Thread for running multimedia operations (e.g., video decoding).
    533   scoped_ptr<base::Thread> media_thread_;
    534 
    535   // Will point to appropriate MessageLoopProxy after initialization,
    536   // regardless of whether |compositor_thread_| is overriden.
    537   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy_;
    538 
    539   // May be null if unused by the |input_handler_manager_|.
    540   scoped_refptr<InputEventFilter> input_event_filter_;
    541   scoped_ptr<InputHandlerManager> input_handler_manager_;
    542   scoped_refptr<IPC::ForwardingMessageFilter> compositor_output_surface_filter_;
    543 
    544   scoped_refptr<webkit::gpu::ContextProviderWebContext>
    545       shared_main_thread_contexts_;
    546 
    547   ObserverList<RenderProcessObserver> observers_;
    548 
    549   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
    550 
    551   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
    552   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
    553 
    554   HistogramCustomizer histogram_customizer_;
    555 
    556   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
    557 
    558 #if defined(ENABLE_WEBRTC)
    559   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
    560 #endif
    561 
    562   // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
    563   // multiple threads. Current allocation mechanism for IOSurface
    564   // backed GpuMemoryBuffers prevent this. crbug.com/325045
    565   base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
    566 
    567   scoped_ptr<MemoryObserver> memory_observer_;
    568 
    569   scoped_refptr<base::SingleThreadTaskRunner>
    570       main_thread_compositor_task_runner_;
    571 
    572   // Compositor settings
    573   bool is_gpu_rasterization_enabled_;
    574   bool is_gpu_rasterization_forced_;
    575   bool is_impl_side_painting_enabled_;
    576   bool is_lcd_text_enabled_;
    577   bool is_distance_field_text_enabled_;
    578   bool is_zero_copy_enabled_;
    579   bool is_one_copy_enabled_;
    580 
    581   std::map<int, mojo::MessagePipeHandle> pending_render_frame_connects_;
    582 
    583   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
    584 };
    585 
    586 }  // namespace content
    587 
    588 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
    589