content/renderer/render_thread_impl.h

   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 MemoryObserver;
  94 class PeerConnectionDependencyFactory;
  95 class MidiMessageFilter;
  96 class NetInfoDispatcher;
  97 class P2PSocketDispatcher;
  98 class PeerConnectionTracker;
  99 class RendererDemuxerAndroid;
 100 class RendererWebKitPlatformSupportImpl;
 101 class RenderProcessObserver;
 102 class VideoCaptureImplManager;
 103 class WebGraphicsContext3DCommandBufferImpl;
 104 class WebRTCIdentityService;
 105
 106 // The RenderThreadImpl class represents a background thread where RenderView
 107 // instances live.  The RenderThread supports an API that is used by its
 108 // consumer to talk indirectly to the RenderViews and supporting objects.
 109 // Likewise, it provides an API for the RenderViews to talk back to the main
 110 // process (i.e., their corresponding WebContentsImpl).
 111 //
 112 // Most of the communication occurs in the form of IPC messages.  They are
 113 // routed to the RenderThread according to the routing IDs of the messages.
 114 // The routing IDs correspond to RenderView instances.
 115 class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
 116                                         public ChildThread,
 117                                         public GpuChannelHostFactory {
 118  public:
 119   static RenderThreadImpl* current();
 120
 121   RenderThreadImpl();
 122   // Constructor that's used when running in single process mode.
 123   explicit RenderThreadImpl(const std::string& channel_name);
 124   virtual ~RenderThreadImpl();
 125   virtual void Shutdown() OVERRIDE;
 126
 127   // When initializing WebKit, ensure that any schemes needed for the content
 128   // module are registered properly.  Static to allow sharing with tests.
 129   static void RegisterSchemes();
 130
 131   // Notify V8 that the date/time configuration of the system might have
 132   // changed.
 133   static void NotifyTimezoneChange();
 134
 135   // RenderThread implementation:
 136   virtual bool Send(IPC::Message* msg) OVERRIDE;
 137   virtual base::MessageLoop* GetMessageLoop() OVERRIDE;
 138   virtual IPC::SyncChannel* GetChannel() OVERRIDE;
 139   virtual std::string GetLocale() OVERRIDE;
 140   virtual IPC::SyncMessageFilter* GetSyncMessageFilter() OVERRIDE;
 141   virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy()
 142       OVERRIDE;
 143   virtual void AddRoute(int32 routing_id, IPC::Listener* listener) OVERRIDE;
 144   virtual void RemoveRoute(int32 routing_id) OVERRIDE;
 145   virtual int GenerateRoutingID() OVERRIDE;
 146   virtual void AddFilter(IPC::MessageFilter* filter) OVERRIDE;
 147   virtual void RemoveFilter(IPC::MessageFilter* filter) OVERRIDE;
 148   virtual void AddObserver(RenderProcessObserver* observer) OVERRIDE;
 149   virtual void RemoveObserver(RenderProcessObserver* observer) OVERRIDE;
 150   virtual void SetResourceDispatcherDelegate(
 151       ResourceDispatcherDelegate* delegate) OVERRIDE;
 152   virtual void EnsureWebKitInitialized() OVERRIDE;
 153   virtual void RecordAction(const base::UserMetricsAction& action) OVERRIDE;
 154   virtual void RecordComputedAction(const std::string& action) OVERRIDE;
 155   virtual scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
 156       size_t buffer_size) OVERRIDE;
 157   virtual void RegisterExtension(v8::Extension* extension) OVERRIDE;
 158   virtual void ScheduleIdleHandler(int64 initial_delay_ms) OVERRIDE;
 159   virtual void IdleHandler() OVERRIDE;
 160   virtual int64 GetIdleNotificationDelayInMs() const OVERRIDE;
 161   virtual void SetIdleNotificationDelayInMs(
 162       int64 idle_notification_delay_in_ms) OVERRIDE;
 163   virtual void UpdateHistograms(int sequence_number) OVERRIDE;
 164   virtual int PostTaskToAllWebWorkers(const base::Closure& closure) OVERRIDE;
 165   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) OVERRIDE;
 166   virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
 167 #if defined(OS_WIN)
 168   virtual void PreCacheFont(const LOGFONT& log_font) OVERRIDE;
 169   virtual void ReleaseCachedFonts() OVERRIDE;
 170 #endif
 171   virtual ServiceRegistry* GetServiceRegistry() OVERRIDE;
 172
 173   // Synchronously establish a channel to the GPU plugin if not previously
 174   // established or if it has been lost (for example if the GPU plugin crashed).
 175   // If there is a pending asynchronous request, it will be completed by the
 176   // time this routine returns.
 177   GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch);
 178
 179
 180   // These methods modify how the next message is sent.  Normally, when sending
 181   // a synchronous message that runs a nested message loop, we need to suspend
 182   // callbacks into WebKit.  This involves disabling timers and deferring
 183   // resource loads.  However, there are exceptions when we need to customize
 184   // the behavior.
 185   void DoNotSuspendWebKitSharedTimer();
 186   void DoNotNotifyWebKitOfModalLoop();
 187
 188   // True if we are running layout tests. This currently disables forwarding
 189   // various status messages to the console, skips network error pages, and
 190   // short circuits size update and focus events.
 191   bool layout_test_mode() const {
 192     return layout_test_mode_;
 193   }
 194   void set_layout_test_mode(bool layout_test_mode) {
 195     layout_test_mode_ = layout_test_mode;
 196   }
 197
 198   RendererWebKitPlatformSupportImpl* webkit_platform_support() const {
 199     DCHECK(webkit_platform_support_);
 200     return webkit_platform_support_.get();
 201   }
 202
 203   IPC::ForwardingMessageFilter* compositor_output_surface_filter() const {
 204     return compositor_output_surface_filter_.get();
 205   }
 206
 207   InputHandlerManager* input_handler_manager() const {
 208     return input_handler_manager_.get();
 209   }
 210
 211   // Will be NULL if threaded compositing has not been enabled.
 212   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy() const {
 213     return compositor_message_loop_proxy_;
 214   }
 215
 216   bool is_gpu_rasterization_enabled() const {
 217     return is_gpu_rasterization_enabled_;
 218   }
 219
 220   bool is_gpu_rasterization_forced() const {
 221     return is_gpu_rasterization_forced_;
 222   }
 223
 224   bool is_impl_side_painting_enabled() const {
 225     return is_impl_side_painting_enabled_;
 226   }
 227
 228   bool is_low_res_tiling_enabled() const { return is_low_res_tiling_enabled_; }
 229
 230   bool is_lcd_text_enabled() const { return is_lcd_text_enabled_; }
 231
 232   bool is_distance_field_text_enabled() const {
 233     return is_distance_field_text_enabled_;
 234   }
 235
 236   bool is_zero_copy_enabled() const { return is_zero_copy_enabled_; }
 237
 238   bool is_one_copy_enabled() const { return is_one_copy_enabled_; }
 239
 240   AppCacheDispatcher* appcache_dispatcher() const {
 241     return appcache_dispatcher_.get();
 242   }
 243
 244   DomStorageDispatcher* dom_storage_dispatcher() const {
 245     return dom_storage_dispatcher_.get();
 246   }
 247
 248   EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
 249     return embedded_worker_dispatcher_.get();
 250   }
 251
 252   AudioInputMessageFilter* audio_input_message_filter() {
 253     return audio_input_message_filter_.get();
 254   }
 255
 256   AudioMessageFilter* audio_message_filter() {
 257     return audio_message_filter_.get();
 258   }
 259
 260   MidiMessageFilter* midi_message_filter() {
 261     return midi_message_filter_.get();
 262   }
 263
 264 #if defined(OS_ANDROID)
 265   RendererDemuxerAndroid* renderer_demuxer() {
 266     return renderer_demuxer_.get();
 267   }
 268 #endif
 269
 270   // Creates the embedder implementation of WebMediaStreamCenter.
 271   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
 272   blink::WebMediaStreamCenter* CreateMediaStreamCenter(
 273       blink::WebMediaStreamCenterClient* client);
 274
 275   // Returns a factory used for creating RTC PeerConnection objects.
 276   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
 277
 278   PeerConnectionTracker* peer_connection_tracker() {
 279     return peer_connection_tracker_.get();
 280   }
 281
 282   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
 283   P2PSocketDispatcher* p2p_socket_dispatcher() {
 284     return p2p_socket_dispatcher_.get();
 285   }
 286
 287   VideoCaptureImplManager* video_capture_impl_manager() const {
 288     return vc_manager_.get();
 289   }
 290
 291   GamepadSharedMemoryReader* gamepad_shared_memory_reader() const {
 292     return gamepad_shared_memory_reader_.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 MessageLoopProxy 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::MessageLoopProxy> GetMediaThreadMessageLoopProxy();
 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   void SetFlingCurveParameters(const std::vector<float>& new_touchpad,
 387                                const std::vector<float>& new_touchscreen);
 388
 389   // Retrieve current gamepad data.
 390   void SampleGamepads(blink::WebGamepads* data);
 391
 392   // Set a listener for gamepad connected/disconnected events.
 393   // A non-null listener must be set first before calling SampleGamepads.
 394   void SetGamepadListener(blink::WebGamepadListener* listener);
 395
 396   // Called by a RenderWidget when it is created or destroyed. This
 397   // allows the process to know when there are no visible widgets.
 398   void WidgetCreated();
 399   void WidgetDestroyed();
 400   void WidgetHidden();
 401   void WidgetRestored();
 402
 403   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
 404   void RemoveEmbeddedWorkerRoute(int32 routing_id);
 405
 406   void RegisterPendingRenderFrameConnect(int routing_id,
 407                                          mojo::ScopedMessagePipeHandle handle);
 408
 409  private:
 410   // ChildThread
 411   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;
 412
 413   // GpuChannelHostFactory implementation:
 414   virtual bool IsMainThread() OVERRIDE;
 415   virtual base::MessageLoop* GetMainLoop() OVERRIDE;
 416   virtual scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() OVERRIDE;
 417   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(
 418       size_t size) OVERRIDE;
 419   virtual CreateCommandBufferResult CreateViewCommandBuffer(
 420       int32 surface_id,
 421       const GPUCreateCommandBufferConfig& init_params,
 422       int32 route_id) OVERRIDE;
 423   virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
 424       size_t width,
 425       size_t height,
 426       unsigned internalformat,
 427       unsigned usage) OVERRIDE;
 428   virtual void DeleteGpuMemoryBuffer(
 429       scoped_ptr<gfx::GpuMemoryBuffer> buffer) OVERRIDE;
 430
 431   void Init();
 432
 433   void OnSetZoomLevelForCurrentURL(const std::string& scheme,
 434                                    const std::string& host,
 435                                    double zoom_level);
 436   void OnCreateNewView(const ViewMsg_New_Params& params);
 437   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
 438   void OnPurgePluginListCache(bool reload_pages);
 439   void OnNetworkTypeChanged(net::NetworkChangeNotifier::ConnectionType type);
 440   void OnGetAccessibilityTree();
 441   void OnTempCrashWithData(const GURL& data);
 442   void OnUpdateTimezone();
 443   void OnMemoryPressure(
 444       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 445 #if defined(OS_ANDROID)
 446   void OnSetWebKitSharedTimersSuspended(bool suspend);
 447 #endif
 448 #if defined(OS_MACOSX)
 449   void OnUpdateScrollbarTheme(float initial_button_delay,
 450                               float autoscroll_button_delay,
 451                               bool jump_on_track_click,
 452                               blink::ScrollerStyle preferred_scroller_style,
 453                               bool redraw);
 454 #endif
 455   void OnCreateNewSharedWorker(
 456       const WorkerProcessMsg_CreateWorker_Params& params);
 457
 458   void IdleHandlerInForegroundTab();
 459
 460   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateOffscreenContext3d();
 461
 462   // These objects live solely on the render thread.
 463   scoped_ptr<AppCacheDispatcher> appcache_dispatcher_;
 464   scoped_ptr<DomStorageDispatcher> dom_storage_dispatcher_;
 465   scoped_ptr<IndexedDBDispatcher> main_thread_indexed_db_dispatcher_;
 466   scoped_ptr<RendererWebKitPlatformSupportImpl> webkit_platform_support_;
 467   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
 468
 469   // Used on the render thread and deleted by WebKit at shutdown.
 470   blink::WebMediaStreamCenter* media_stream_center_;
 471
 472   // Used on the renderer and IPC threads.
 473   scoped_refptr<DBMessageFilter> db_message_filter_;
 474   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
 475   scoped_refptr<AudioMessageFilter> audio_message_filter_;
 476   scoped_refptr<MidiMessageFilter> midi_message_filter_;
 477 #if defined(OS_ANDROID)
 478   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
 479 #endif
 480   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
 481
 482   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
 483
 484   // This is used to communicate to the browser process the status
 485   // of all the peer connections created in the renderer.
 486   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
 487
 488   // Dispatches all P2P sockets.
 489   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
 490
 491   // Used on the render thread.
 492   scoped_ptr<VideoCaptureImplManager> vc_manager_;
 493
 494   // Used for communicating registering AEC dump consumers with the browser and
 495   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
 496   // diagnostic audio data for WebRTC stored locally when enabled by the user in
 497   // chrome://webrtc-internals.
 498   scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
 499
 500   // The count of RenderWidgets running through this thread.
 501   int widget_count_;
 502
 503   // The count of hidden RenderWidgets running through this thread.
 504   int hidden_widget_count_;
 505
 506   // The current value of the idle notification timer delay.
 507   int64 idle_notification_delay_in_ms_;
 508
 509   // The number of idle handler calls that skip sending idle notifications.
 510   int idle_notifications_to_skip_;
 511
 512   bool suspend_webkit_shared_timer_;
 513   bool notify_webkit_of_modal_loop_;
 514   bool webkit_shared_timer_suspended_;
 515
 516   // The following flag is used to control layout test specific behavior.
 517   bool layout_test_mode_;
 518
 519   // Timer that periodically calls IdleHandler.
 520   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
 521
 522   // The channel from the renderer process to the GPU process.
 523   scoped_refptr<GpuChannelHost> gpu_channel_;
 524
 525   // Cache of variables that are needed on the compositor thread by
 526   // GpuChannelHostFactory methods.
 527   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 528
 529   // A lazily initiated thread on which file operations are run.
 530   scoped_ptr<base::Thread> file_thread_;
 531
 532   // May be null if overridden by ContentRendererClient.
 533   scoped_ptr<base::Thread> compositor_thread_;
 534
 535   // Thread for running multimedia operations (e.g., video decoding).
 536   scoped_ptr<base::Thread> media_thread_;
 537
 538   // Will point to appropriate MessageLoopProxy after initialization,
 539   // regardless of whether |compositor_thread_| is overriden.
 540   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy_;
 541
 542   // May be null if unused by the |input_handler_manager_|.
 543   scoped_refptr<InputEventFilter> input_event_filter_;
 544   scoped_ptr<InputHandlerManager> input_handler_manager_;
 545   scoped_refptr<IPC::ForwardingMessageFilter> compositor_output_surface_filter_;
 546
 547   scoped_refptr<ContextProviderCommandBuffer> shared_main_thread_contexts_;
 548
 549   ObserverList<RenderProcessObserver> observers_;
 550
 551   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
 552
 553   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
 554   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 555
 556   HistogramCustomizer histogram_customizer_;
 557
 558   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 559
 560   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 561
 562   scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 563
 564   // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
 565   // multiple threads. Current allocation mechanism for IOSurface
 566   // backed GpuMemoryBuffers prevent this. crbug.com/325045
 567   base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
 568
 569   scoped_ptr<MemoryObserver> memory_observer_;
 570
 571   // Compositor settings
 572   bool is_gpu_rasterization_enabled_;
 573   bool is_gpu_rasterization_forced_;
 574   bool is_impl_side_painting_enabled_;
 575   bool is_low_res_tiling_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_