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 WebGraphicsContext3D;
  40 class WebMediaStreamCenter;
  41 class WebMediaStreamCenterClient;
  42 }
  43
  44 namespace base {
  45 class MessageLoopProxy;
  46 class Thread;
  47 }
  48
  49 namespace cc {
  50 class ContextProvider;
  51 }
  52
  53 namespace IPC {
  54 class ForwardingMessageFilter;
  55 class MessageFilter;
  56 }
  57
  58 namespace media {
  59 class AudioHardwareConfig;
  60 class GpuVideoAcceleratorFactories;
  61 }
  62
  63 namespace v8 {
  64 class Extension;
  65 }
  66
  67 namespace webkit {
  68 namespace gpu {
  69 class ContextProviderWebContext;
  70 class GrContextForWebGraphicsContext3D;
  71 }
  72 }
  73
  74 namespace content {
  75
  76 class AppCacheDispatcher;
  77 class AecDumpMessageFilter;
  78 class AudioInputMessageFilter;
  79 class AudioMessageFilter;
  80 class AudioRendererMixerManager;
  81 class ContextProviderCommandBuffer;
  82 class DBMessageFilter;
  83 class DevToolsAgentFilter;
  84 class DomStorageDispatcher;
  85 class EmbeddedWorkerDispatcher;
  86 class GpuChannelHost;
  87 class IndexedDBDispatcher;
  88 class InputEventFilter;
  89 class InputHandlerManager;
  90 class MediaStreamCenter;
  91 class MemoryObserver;
  92 class PeerConnectionDependencyFactory;
  93 class MidiMessageFilter;
  94 class NetInfoDispatcher;
  95 class P2PSocketDispatcher;
  96 class PeerConnectionTracker;
  97 class RendererDemuxerAndroid;
  98 class RendererWebKitPlatformSupportImpl;
  99 class RenderProcessObserver;
 100 class VideoCaptureImplManager;
 101 class WebGraphicsContext3DCommandBufferImpl;
 102 class WebRTCIdentityService;
 103
 104 // The RenderThreadImpl class represents a background thread where RenderView
 105 // instances live.  The RenderThread supports an API that is used by its
 106 // consumer to talk indirectly to the RenderViews and supporting objects.
 107 // Likewise, it provides an API for the RenderViews to talk back to the main
 108 // process (i.e., their corresponding WebContentsImpl).
 109 //
 110 // Most of the communication occurs in the form of IPC messages.  They are
 111 // routed to the RenderThread according to the routing IDs of the messages.
 112 // The routing IDs correspond to RenderView instances.
 113 class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
 114                                         public ChildThread,
 115                                         public GpuChannelHostFactory {
 116  public:
 117   static RenderThreadImpl* current();
 118
 119   RenderThreadImpl();
 120   // Constructor that's used when running in single process mode.
 121   explicit RenderThreadImpl(const std::string& channel_name);
 122   virtual ~RenderThreadImpl();
 123   virtual void Shutdown() OVERRIDE;
 124
 125   // When initializing WebKit, ensure that any schemes needed for the content
 126   // module are registered properly.  Static to allow sharing with tests.
 127   static void RegisterSchemes();
 128
 129   // Notify V8 that the date/time configuration of the system might have
 130   // changed.
 131   static void NotifyTimezoneChange();
 132
 133   // RenderThread implementation:
 134   virtual bool Send(IPC::Message* msg) OVERRIDE;
 135   virtual base::MessageLoop* GetMessageLoop() OVERRIDE;
 136   virtual IPC::SyncChannel* GetChannel() OVERRIDE;
 137   virtual std::string GetLocale() OVERRIDE;
 138   virtual IPC::SyncMessageFilter* GetSyncMessageFilter() OVERRIDE;
 139   virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy()
 140       OVERRIDE;
 141   virtual void AddRoute(int32 routing_id, IPC::Listener* listener) OVERRIDE;
 142   virtual void RemoveRoute(int32 routing_id) OVERRIDE;
 143   virtual int GenerateRoutingID() OVERRIDE;
 144   virtual void AddFilter(IPC::MessageFilter* filter) OVERRIDE;
 145   virtual void RemoveFilter(IPC::MessageFilter* filter) OVERRIDE;
 146   virtual void AddObserver(RenderProcessObserver* observer) OVERRIDE;
 147   virtual void RemoveObserver(RenderProcessObserver* observer) OVERRIDE;
 148   virtual void SetResourceDispatcherDelegate(
 149       ResourceDispatcherDelegate* delegate) OVERRIDE;
 150   virtual void EnsureWebKitInitialized() OVERRIDE;
 151   virtual void RecordAction(const base::UserMetricsAction& action) OVERRIDE;
 152   virtual void RecordComputedAction(const std::string& action) OVERRIDE;
 153   virtual scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
 154       size_t buffer_size) OVERRIDE;
 155   virtual void RegisterExtension(v8::Extension* extension) OVERRIDE;
 156   virtual void ScheduleIdleHandler(int64 initial_delay_ms) OVERRIDE;
 157   virtual void IdleHandler() OVERRIDE;
 158   virtual int64 GetIdleNotificationDelayInMs() const OVERRIDE;
 159   virtual void SetIdleNotificationDelayInMs(
 160       int64 idle_notification_delay_in_ms) OVERRIDE;
 161   virtual void UpdateHistograms(int sequence_number) OVERRIDE;
 162   virtual int PostTaskToAllWebWorkers(const base::Closure& closure) OVERRIDE;
 163   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) OVERRIDE;
 164   virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
 165 #if defined(OS_WIN)
 166   virtual void PreCacheFont(const LOGFONT& log_font) OVERRIDE;
 167   virtual void ReleaseCachedFonts() OVERRIDE;
 168 #endif
 169   virtual ServiceRegistry* GetServiceRegistry() OVERRIDE;
 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 #if defined(ENABLE_WEBRTC)
 274   // Returns a factory used for creating RTC PeerConnection objects.
 275   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
 276
 277   PeerConnectionTracker* peer_connection_tracker() {
 278     return peer_connection_tracker_.get();
 279   }
 280
 281   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
 282   P2PSocketDispatcher* p2p_socket_dispatcher() {
 283     return p2p_socket_dispatcher_.get();
 284   }
 285 #endif
 286
 287   VideoCaptureImplManager* video_capture_impl_manager() const {
 288     return vc_manager_.get();
 289   }
 290
 291   // Get the GPU channel. Returns NULL if the channel is not established or
 292   // has been lost.
 293   GpuChannelHost* GetGpuChannel();
 294
 295   // Returns a MessageLoopProxy instance corresponding to the message loop
 296   // of the thread on which file operations should be run. Must be called
 297   // on the renderer's main thread.
 298   scoped_refptr<base::MessageLoopProxy> GetFileThreadMessageLoopProxy();
 299
 300   // Returns a MessageLoopProxy instance corresponding to the message loop
 301   // of the thread on which media operations should be run. Must be called
 302   // on the renderer's main thread.
 303   scoped_refptr<base::MessageLoopProxy> GetMediaThreadMessageLoopProxy();
 304
 305   // Causes the idle handler to skip sending idle notifications
 306   // on the two next scheduled calls, so idle notifications are
 307   // not sent for at least one notification delay.
 308   void PostponeIdleNotification();
 309
 310   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
 311
 312   scoped_refptr<webkit::gpu::ContextProviderWebContext>
 313       SharedMainThreadContextProvider();
 314
 315   // AudioRendererMixerManager instance which manages renderer side mixer
 316   // instances shared based on configured audio parameters.  Lazily created on
 317   // first call.
 318   AudioRendererMixerManager* GetAudioRendererMixerManager();
 319
 320   // AudioHardwareConfig contains audio hardware configuration for
 321   // renderer side clients.  Creation requires a synchronous IPC call so it is
 322   // lazily created on the first call.
 323   media::AudioHardwareConfig* GetAudioHardwareConfig();
 324
 325 #if defined(OS_WIN)
 326   void PreCacheFontCharacters(const LOGFONT& log_font,
 327                               const base::string16& str);
 328 #endif
 329
 330 #if defined(ENABLE_WEBRTC)
 331   WebRTCIdentityService* get_webrtc_identity_service() {
 332     return webrtc_identity_service_.get();
 333   }
 334 #endif
 335
 336   // For producing custom V8 histograms. Custom histograms are produced if all
 337   // RenderViews share the same host, and the host is in the pre-specified set
 338   // of hosts we want to produce custom diagrams for. The name for a custom
 339   // diagram is the name of the corresponding generic diagram plus a
 340   // host-specific suffix.
 341   class CONTENT_EXPORT HistogramCustomizer {
 342    public:
 343     HistogramCustomizer();
 344     ~HistogramCustomizer();
 345
 346     // Called when a top frame of a RenderView navigates. This function updates
 347     // RenderThreadImpl's information about whether all RenderViews are
 348     // displaying a page from the same host. |host| is the host where a
 349     // RenderView navigated, and |view_count| is the number of RenderViews in
 350     // this process.
 351     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
 352
 353     // Used for customizing some histograms if all RenderViews share the same
 354     // host. Returns the current custom histogram name to use for
 355     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
 356     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
 357
 358    private:
 359     friend class RenderThreadImplUnittest;
 360
 361     // Used for updating the information on which is the common host which all
 362     // RenderView's share (if any). If there is no common host, this function is
 363     // called with an empty string.
 364     void SetCommonHost(const std::string& host);
 365
 366     // The current common host of the RenderViews; empty string if there is no
 367     // common host.
 368     std::string common_host_;
 369     // The corresponding suffix.
 370     std::string common_host_histogram_suffix_;
 371     // Set of histograms for which we want to produce a custom histogram if
 372     // possible.
 373     std::set<std::string> custom_histograms_;
 374
 375     DISALLOW_COPY_AND_ASSIGN(HistogramCustomizer);
 376   };
 377
 378   HistogramCustomizer* histogram_customizer() {
 379     return &histogram_customizer_;
 380   }
 381
 382   void SetFlingCurveParameters(const std::vector<float>& new_touchpad,
 383                                const std::vector<float>& new_touchscreen);
 384
 385   // Retrieve current gamepad data.
 386   void SampleGamepads(blink::WebGamepads* data);
 387
 388   // Called by a RenderWidget when it is created or destroyed. This
 389   // allows the process to know when there are no visible widgets.
 390   void WidgetCreated();
 391   void WidgetDestroyed();
 392   void WidgetHidden();
 393   void WidgetRestored();
 394
 395   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
 396   void RemoveEmbeddedWorkerRoute(int32 routing_id);
 397
 398   void RegisterPendingRenderFrameConnect(int routing_id,
 399                                          mojo::ScopedMessagePipeHandle handle);
 400
 401  private:
 402   // ChildThread
 403   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;
 404
 405   // GpuChannelHostFactory implementation:
 406   virtual bool IsMainThread() OVERRIDE;
 407   virtual base::MessageLoop* GetMainLoop() OVERRIDE;
 408   virtual scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() OVERRIDE;
 409   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(
 410       size_t size) OVERRIDE;
 411   virtual CreateCommandBufferResult CreateViewCommandBuffer(
 412       int32 surface_id,
 413       const GPUCreateCommandBufferConfig& init_params,
 414       int32 route_id) OVERRIDE;
 415   virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
 416       size_t width,
 417       size_t height,
 418       unsigned internalformat,
 419       unsigned usage) OVERRIDE;
 420   virtual void DeleteGpuMemoryBuffer(
 421       scoped_ptr<gfx::GpuMemoryBuffer> buffer) OVERRIDE;
 422
 423   void Init();
 424
 425   void OnCreateNewFrame(int routing_id, int parent_routing_id);
 426   void OnCreateNewFrameProxy(int routing_id,
 427                              int parent_routing_id,
 428                              int render_view_routing_id);
 429   void OnSetZoomLevelForCurrentURL(const std::string& scheme,
 430                                    const std::string& host,
 431                                    double zoom_level);
 432   void OnCreateNewView(const ViewMsg_New_Params& params);
 433   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
 434   void OnPurgePluginListCache(bool reload_pages);
 435   void OnNetworkTypeChanged(net::NetworkChangeNotifier::ConnectionType type);
 436   void OnGetAccessibilityTree();
 437   void OnTempCrashWithData(const GURL& data);
 438   void OnUpdateTimezone();
 439   void OnMemoryPressure(
 440       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 441 #if defined(OS_ANDROID)
 442   void OnSetWebKitSharedTimersSuspended(bool suspend);
 443 #endif
 444 #if defined(OS_MACOSX)
 445   void OnUpdateScrollbarTheme(float initial_button_delay,
 446                               float autoscroll_button_delay,
 447                               bool jump_on_track_click,
 448                               blink::ScrollerStyle preferred_scroller_style,
 449                               bool redraw);
 450 #endif
 451   void OnCreateNewSharedWorker(
 452       const WorkerProcessMsg_CreateWorker_Params& params);
 453
 454   void IdleHandlerInForegroundTab();
 455
 456   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateOffscreenContext3d();
 457
 458   // These objects live solely on the render thread.
 459   scoped_ptr<AppCacheDispatcher> appcache_dispatcher_;
 460   scoped_ptr<DomStorageDispatcher> dom_storage_dispatcher_;
 461   scoped_ptr<IndexedDBDispatcher> main_thread_indexed_db_dispatcher_;
 462   scoped_ptr<RendererWebKitPlatformSupportImpl> webkit_platform_support_;
 463   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
 464
 465   // Used on the render thread and deleted by WebKit at shutdown.
 466   blink::WebMediaStreamCenter* media_stream_center_;
 467
 468   // Used on the renderer and IPC threads.
 469   scoped_refptr<DBMessageFilter> db_message_filter_;
 470   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
 471   scoped_refptr<AudioMessageFilter> audio_message_filter_;
 472   scoped_refptr<MidiMessageFilter> midi_message_filter_;
 473 #if defined(OS_ANDROID)
 474   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
 475 #endif
 476   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
 477
 478 #if defined(ENABLE_WEBRTC)
 479   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
 480
 481   // This is used to communicate to the browser process the status
 482   // of all the peer connections created in the renderer.
 483   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
 484
 485   // Dispatches all P2P sockets.
 486   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
 487 #endif
 488
 489   // Used on the render thread.
 490   scoped_ptr<VideoCaptureImplManager> vc_manager_;
 491
 492   // Used for communicating registering AEC dump consumers with the browser and
 493   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
 494   // diagnostic audio data for WebRTC stored locally when enabled by the user in
 495   // chrome://webrtc-internals.
 496   scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
 497
 498   // The count of RenderWidgets running through this thread.
 499   int widget_count_;
 500
 501   // The count of hidden RenderWidgets running through this thread.
 502   int hidden_widget_count_;
 503
 504   // The current value of the idle notification timer delay.
 505   int64 idle_notification_delay_in_ms_;
 506
 507   // The number of idle handler calls that skip sending idle notifications.
 508   int idle_notifications_to_skip_;
 509
 510   bool suspend_webkit_shared_timer_;
 511   bool notify_webkit_of_modal_loop_;
 512   bool webkit_shared_timer_suspended_;
 513
 514   // The following flag is used to control layout test specific behavior.
 515   bool layout_test_mode_;
 516
 517   // Timer that periodically calls IdleHandler.
 518   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
 519
 520   // The channel from the renderer process to the GPU process.
 521   scoped_refptr<GpuChannelHost> gpu_channel_;
 522
 523   // Cache of variables that are needed on the compositor thread by
 524   // GpuChannelHostFactory methods.
 525   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 526
 527   // A lazily initiated thread on which file operations are run.
 528   scoped_ptr<base::Thread> file_thread_;
 529
 530   // May be null if overridden by ContentRendererClient.
 531   scoped_ptr<base::Thread> compositor_thread_;
 532
 533   // Thread for running multimedia operations (e.g., video decoding).
 534   scoped_ptr<base::Thread> media_thread_;
 535
 536   // Will point to appropriate MessageLoopProxy after initialization,
 537   // regardless of whether |compositor_thread_| is overriden.
 538   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy_;
 539
 540   // May be null if unused by the |input_handler_manager_|.
 541   scoped_refptr<InputEventFilter> input_event_filter_;
 542   scoped_ptr<InputHandlerManager> input_handler_manager_;
 543   scoped_refptr<IPC::ForwardingMessageFilter> compositor_output_surface_filter_;
 544
 545   scoped_refptr<webkit::gpu::ContextProviderWebContext>
 546       shared_main_thread_contexts_;
 547
 548   ObserverList<RenderProcessObserver> observers_;
 549
 550   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
 551
 552   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
 553   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 554
 555   HistogramCustomizer histogram_customizer_;
 556
 557   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 558
 559 #if defined(ENABLE_WEBRTC)
 560   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 561 #endif
 562
 563   // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
 564   // multiple threads. Current allocation mechanism for IOSurface
 565   // backed GpuMemoryBuffers prevent this. crbug.com/325045
 566   base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
 567
 568   scoped_ptr<MemoryObserver> memory_observer_;
 569
 570   // Compositor settings
 571   bool is_gpu_rasterization_enabled_;
 572   bool is_gpu_rasterization_forced_;
 573   bool is_impl_side_painting_enabled_;
 574   bool is_low_res_tiling_enabled_;
 575   bool is_lcd_text_enabled_;
 576   bool is_distance_field_text_enabled_;
 577   bool is_zero_copy_enabled_;
 578   bool is_one_copy_enabled_;
 579
 580   std::map<int, mojo::MessagePipeHandle> pending_render_frame_connects_;
 581
 582   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 583 };
 584
 585 }  // namespace content
 586
 587 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_