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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 WebGamepadListener;
     40 class WebGraphicsContext3D;
     41 class WebMediaStreamCenter;
     42 class WebMediaStreamCenterClient;
     43 }
     44 
     45 namespace base {
     46 class MessageLoopProxy;
     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 GamepadSharedMemoryReader;
     88 class GpuChannelHost;
     89 class IndexedDBDispatcher;
     90 class InputEventFilter;
     91 class InputHandlerManager;
     92 class MediaStreamCenter;
     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 
    171   // Synchronously establish a channel to the GPU plugin if not previously
    172   // established or if it has been lost (for example if the GPU plugin crashed).
    173   // If there is a pending asynchronous request, it will be completed by the
    174   // time this routine returns.
    175   GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch);
    176 
    177 
    178   // These methods modify how the next message is sent.  Normally, when sending
    179   // a synchronous message that runs a nested message loop, we need to suspend
    180   // callbacks into WebKit.  This involves disabling timers and deferring
    181   // resource loads.  However, there are exceptions when we need to customize
    182   // the behavior.
    183   void DoNotSuspendWebKitSharedTimer();
    184   void DoNotNotifyWebKitOfModalLoop();
    185 
    186   // True if we are running layout tests. This currently disables forwarding
    187   // various status messages to the console, skips network error pages, and
    188   // short circuits size update and focus events.
    189   bool layout_test_mode() const {
    190     return layout_test_mode_;
    191   }
    192   void set_layout_test_mode(bool layout_test_mode) {
    193     layout_test_mode_ = layout_test_mode;
    194   }
    195 
    196   RendererWebKitPlatformSupportImpl* webkit_platform_support() const {
    197     DCHECK(webkit_platform_support_);
    198     return webkit_platform_support_.get();
    199   }
    200 
    201   IPC::ForwardingMessageFilter* compositor_output_surface_filter() const {
    202     return compositor_output_surface_filter_.get();
    203   }
    204 
    205   InputHandlerManager* input_handler_manager() const {
    206     return input_handler_manager_.get();
    207   }
    208 
    209   // Will be NULL if threaded compositing has not been enabled.
    210   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy() const {
    211     return compositor_message_loop_proxy_;
    212   }
    213 
    214   bool is_gpu_rasterization_enabled() const {
    215     return is_gpu_rasterization_enabled_;
    216   }
    217 
    218   bool is_gpu_rasterization_forced() const {
    219     return is_gpu_rasterization_forced_;
    220   }
    221 
    222   bool is_impl_side_painting_enabled() const {
    223     return is_impl_side_painting_enabled_;
    224   }
    225 
    226   bool is_low_res_tiling_enabled() const { return is_low_res_tiling_enabled_; }
    227 
    228   bool is_lcd_text_enabled() const { return is_lcd_text_enabled_; }
    229 
    230   bool is_distance_field_text_enabled() const {
    231     return is_distance_field_text_enabled_;
    232   }
    233 
    234   bool is_zero_copy_enabled() const { return is_zero_copy_enabled_; }
    235 
    236   bool is_one_copy_enabled() const { return is_one_copy_enabled_; }
    237 
    238   AppCacheDispatcher* appcache_dispatcher() const {
    239     return appcache_dispatcher_.get();
    240   }
    241 
    242   DomStorageDispatcher* dom_storage_dispatcher() const {
    243     return dom_storage_dispatcher_.get();
    244   }
    245 
    246   EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
    247     return embedded_worker_dispatcher_.get();
    248   }
    249 
    250   AudioInputMessageFilter* audio_input_message_filter() {
    251     return audio_input_message_filter_.get();
    252   }
    253 
    254   AudioMessageFilter* audio_message_filter() {
    255     return audio_message_filter_.get();
    256   }
    257 
    258   MidiMessageFilter* midi_message_filter() {
    259     return midi_message_filter_.get();
    260   }
    261 
    262 #if defined(OS_ANDROID)
    263   RendererDemuxerAndroid* renderer_demuxer() {
    264     return renderer_demuxer_.get();
    265   }
    266 #endif
    267 
    268   // Creates the embedder implementation of WebMediaStreamCenter.
    269   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
    270   blink::WebMediaStreamCenter* CreateMediaStreamCenter(
    271       blink::WebMediaStreamCenterClient* client);
    272 
    273   // Returns a factory used for creating RTC PeerConnection objects.
    274   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
    275 
    276   PeerConnectionTracker* peer_connection_tracker() {
    277     return peer_connection_tracker_.get();
    278   }
    279 
    280   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
    281   P2PSocketDispatcher* p2p_socket_dispatcher() {
    282     return p2p_socket_dispatcher_.get();
    283   }
    284 
    285   VideoCaptureImplManager* video_capture_impl_manager() const {
    286     return vc_manager_.get();
    287   }
    288 
    289   GamepadSharedMemoryReader* gamepad_shared_memory_reader() const {
    290     return gamepad_shared_memory_reader_.get();
    291   }
    292 
    293   // Get the GPU channel. Returns NULL if the channel is not established or
    294   // has been lost.
    295   GpuChannelHost* GetGpuChannel();
    296 
    297   // Returns a MessageLoopProxy instance corresponding to the message loop
    298   // of the thread on which file operations should be run. Must be called
    299   // on the renderer's main thread.
    300   scoped_refptr<base::MessageLoopProxy> GetFileThreadMessageLoopProxy();
    301 
    302   // Returns a MessageLoopProxy instance corresponding to the message loop
    303   // of the thread on which media operations should be run. Must be called
    304   // on the renderer's main thread.
    305   scoped_refptr<base::MessageLoopProxy> GetMediaThreadMessageLoopProxy();
    306 
    307   // Causes the idle handler to skip sending idle notifications
    308   // on the two next scheduled calls, so idle notifications are
    309   // not sent for at least one notification delay.
    310   void PostponeIdleNotification();
    311 
    312   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
    313 
    314   scoped_refptr<webkit::gpu::ContextProviderWebContext>
    315       SharedMainThreadContextProvider();
    316 
    317   // AudioRendererMixerManager instance which manages renderer side mixer
    318   // instances shared based on configured audio parameters.  Lazily created on
    319   // first call.
    320   AudioRendererMixerManager* GetAudioRendererMixerManager();
    321 
    322   // AudioHardwareConfig contains audio hardware configuration for
    323   // renderer side clients.  Creation requires a synchronous IPC call so it is
    324   // lazily created on the first call.
    325   media::AudioHardwareConfig* GetAudioHardwareConfig();
    326 
    327 #if defined(OS_WIN)
    328   void PreCacheFontCharacters(const LOGFONT& log_font,
    329                               const base::string16& str);
    330 #endif
    331 
    332 #if defined(ENABLE_WEBRTC)
    333   WebRTCIdentityService* get_webrtc_identity_service() {
    334     return webrtc_identity_service_.get();
    335   }
    336 #endif
    337 
    338   // For producing custom V8 histograms. Custom histograms are produced if all
    339   // RenderViews share the same host, and the host is in the pre-specified set
    340   // of hosts we want to produce custom diagrams for. The name for a custom
    341   // diagram is the name of the corresponding generic diagram plus a
    342   // host-specific suffix.
    343   class CONTENT_EXPORT HistogramCustomizer {
    344    public:
    345     HistogramCustomizer();
    346     ~HistogramCustomizer();
    347 
    348     // Called when a top frame of a RenderView navigates. This function updates
    349     // RenderThreadImpl's information about whether all RenderViews are
    350     // displaying a page from the same host. |host| is the host where a
    351     // RenderView navigated, and |view_count| is the number of RenderViews in
    352     // this process.
    353     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
    354 
    355     // Used for customizing some histograms if all RenderViews share the same
    356     // host. Returns the current custom histogram name to use for
    357     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
    358     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
    359 
    360    private:
    361     friend class RenderThreadImplUnittest;
    362 
    363     // Used for updating the information on which is the common host which all
    364     // RenderView's share (if any). If there is no common host, this function is
    365     // called with an empty string.
    366     void SetCommonHost(const std::string& host);
    367 
    368     // The current common host of the RenderViews; empty string if there is no
    369     // common host.
    370     std::string common_host_;
    371     // The corresponding suffix.
    372     std::string common_host_histogram_suffix_;
    373     // Set of histograms for which we want to produce a custom histogram if
    374     // possible.
    375     std::set<std::string> custom_histograms_;
    376 
    377     DISALLOW_COPY_AND_ASSIGN(HistogramCustomizer);
    378   };
    379 
    380   HistogramCustomizer* histogram_customizer() {
    381     return &histogram_customizer_;
    382   }
    383 
    384   void SetFlingCurveParameters(const std::vector<float>& new_touchpad,
    385                                const std::vector<float>& new_touchscreen);
    386 
    387   // Retrieve current gamepad data.
    388   void SampleGamepads(blink::WebGamepads* data);
    389 
    390   // Set a listener for gamepad connected/disconnected events.
    391   // A non-null listener must be set first before calling SampleGamepads.
    392   void SetGamepadListener(blink::WebGamepadListener* listener);
    393 
    394   // Called by a RenderWidget when it is created or destroyed. This
    395   // allows the process to know when there are no visible widgets.
    396   void WidgetCreated();
    397   void WidgetDestroyed();
    398   void WidgetHidden();
    399   void WidgetRestored();
    400 
    401   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
    402   void RemoveEmbeddedWorkerRoute(int32 routing_id);
    403 
    404  private:
    405   // ChildThread
    406   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;
    407 
    408   // GpuChannelHostFactory implementation:
    409   virtual bool IsMainThread() OVERRIDE;
    410   virtual base::MessageLoop* GetMainLoop() OVERRIDE;
    411   virtual scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() OVERRIDE;
    412   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(
    413       size_t size) OVERRIDE;
    414   virtual CreateCommandBufferResult CreateViewCommandBuffer(
    415       int32 surface_id,
    416       const GPUCreateCommandBufferConfig& init_params,
    417       int32 route_id) OVERRIDE;
    418   virtual void CreateImage(
    419       gfx::PluginWindowHandle window,
    420       int32 image_id,
    421       const CreateImageCallback& callback) OVERRIDE;
    422   virtual void DeleteImage(int32 image_id, int32 sync_point) OVERRIDE;
    423   virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
    424       size_t width,
    425       size_t height,
    426       unsigned internalformat,
    427       unsigned usage) OVERRIDE;
    428 
    429   // mojo::ServiceProvider implementation:
    430   virtual void ConnectToService(
    431       const mojo::String& service_url,
    432       const mojo::String& service_name,
    433       mojo::ScopedMessagePipeHandle message_pipe,
    434       const mojo::String& requestor_url) OVERRIDE;
    435 
    436   void Init();
    437 
    438   void OnSetZoomLevelForCurrentURL(const std::string& scheme,
    439                                    const std::string& host,
    440                                    double zoom_level);
    441   void OnCreateNewView(const ViewMsg_New_Params& params);
    442   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
    443   void OnPurgePluginListCache(bool reload_pages);
    444   void OnNetworkTypeChanged(net::NetworkChangeNotifier::ConnectionType type);
    445   void OnGetAccessibilityTree();
    446   void OnTempCrashWithData(const GURL& data);
    447   void OnUpdateTimezone();
    448   void OnMemoryPressure(
    449       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
    450 #if defined(OS_ANDROID)
    451   void OnSetWebKitSharedTimersSuspended(bool suspend);
    452 #endif
    453 #if defined(OS_MACOSX)
    454   void OnUpdateScrollbarTheme(float initial_button_delay,
    455                               float autoscroll_button_delay,
    456                               bool jump_on_track_click,
    457                               blink::ScrollerStyle preferred_scroller_style,
    458                               bool redraw);
    459 #endif
    460   void OnCreateNewSharedWorker(
    461       const WorkerProcessMsg_CreateWorker_Params& params);
    462 
    463   void IdleHandlerInForegroundTab();
    464 
    465   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateOffscreenContext3d();
    466 
    467   // These objects live solely on the render thread.
    468   scoped_ptr<AppCacheDispatcher> appcache_dispatcher_;
    469   scoped_ptr<DomStorageDispatcher> dom_storage_dispatcher_;
    470   scoped_ptr<IndexedDBDispatcher> main_thread_indexed_db_dispatcher_;
    471   scoped_ptr<RendererWebKitPlatformSupportImpl> webkit_platform_support_;
    472   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
    473 
    474   // Used on the render thread and deleted by WebKit at shutdown.
    475   blink::WebMediaStreamCenter* media_stream_center_;
    476 
    477   // Used on the renderer and IPC threads.
    478   scoped_refptr<DBMessageFilter> db_message_filter_;
    479   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
    480   scoped_refptr<AudioMessageFilter> audio_message_filter_;
    481   scoped_refptr<MidiMessageFilter> midi_message_filter_;
    482 #if defined(OS_ANDROID)
    483   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
    484 #endif
    485   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
    486 
    487   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
    488 
    489   // This is used to communicate to the browser process the status
    490   // of all the peer connections created in the renderer.
    491   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
    492 
    493   // Dispatches all P2P sockets.
    494   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
    495 
    496   // Used on the render thread.
    497   scoped_ptr<VideoCaptureImplManager> vc_manager_;
    498 
    499   // Used for communicating registering AEC dump consumers with the browser and
    500   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
    501   // diagnostic audio data for WebRTC stored locally when enabled by the user in
    502   // chrome://webrtc-internals.
    503   scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
    504 
    505   // The count of RenderWidgets running through this thread.
    506   int widget_count_;
    507 
    508   // The count of hidden RenderWidgets running through this thread.
    509   int hidden_widget_count_;
    510 
    511   // The current value of the idle notification timer delay.
    512   int64 idle_notification_delay_in_ms_;
    513 
    514   // The number of idle handler calls that skip sending idle notifications.
    515   int idle_notifications_to_skip_;
    516 
    517   bool suspend_webkit_shared_timer_;
    518   bool notify_webkit_of_modal_loop_;
    519   bool webkit_shared_timer_suspended_;
    520 
    521   // The following flag is used to control layout test specific behavior.
    522   bool layout_test_mode_;
    523 
    524   // Timer that periodically calls IdleHandler.
    525   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
    526 
    527   // The channel from the renderer process to the GPU process.
    528   scoped_refptr<GpuChannelHost> gpu_channel_;
    529 
    530   // Cache of variables that are needed on the compositor thread by
    531   // GpuChannelHostFactory methods.
    532   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
    533 
    534   // A lazily initiated thread on which file operations are run.
    535   scoped_ptr<base::Thread> file_thread_;
    536 
    537   // May be null if overridden by ContentRendererClient.
    538   scoped_ptr<base::Thread> compositor_thread_;
    539 
    540   // Thread for running multimedia operations (e.g., video decoding).
    541   scoped_ptr<base::Thread> media_thread_;
    542 
    543   // Will point to appropriate MessageLoopProxy after initialization,
    544   // regardless of whether |compositor_thread_| is overriden.
    545   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy_;
    546 
    547   // May be null if unused by the |input_handler_manager_|.
    548   scoped_refptr<InputEventFilter> input_event_filter_;
    549   scoped_ptr<InputHandlerManager> input_handler_manager_;
    550   scoped_refptr<IPC::ForwardingMessageFilter> compositor_output_surface_filter_;
    551 
    552   scoped_refptr<ContextProviderCommandBuffer> shared_main_thread_contexts_;
    553 
    554   ObserverList<RenderProcessObserver> observers_;
    555 
    556   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
    557 
    558   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
    559   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
    560 
    561   HistogramCustomizer histogram_customizer_;
    562 
    563   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
    564 
    565   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
    566 
    567   scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
    568 
    569   // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
    570   // multiple threads. Current allocation mechanism for IOSurface
    571   // backed GpuMemoryBuffers prevent this. crbug.com/325045
    572   base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
    573 
    574   // Compositor settings
    575   bool is_gpu_rasterization_enabled_;
    576   bool is_gpu_rasterization_forced_;
    577   bool is_impl_side_painting_enabled_;
    578   bool is_low_res_tiling_enabled_;
    579   bool is_lcd_text_enabled_;
    580   bool is_distance_field_text_enabled_;
    581   bool is_zero_copy_enabled_;
    582   bool is_one_copy_enabled_;
    583 
    584   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
    585 };
    586 
    587 }  // namespace content
    588 
    589 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
    590