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/cancelable_callback.h"
  13 #include "base/memory/memory_pressure_listener.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/metrics/user_metrics_action.h"
  16 #include "base/observer_list.h"
  17 #include "base/strings/string16.h"
  18 #include "base/threading/thread_checker.h"
  19 #include "base/timer/timer.h"
  20 #include "build/build_config.h"
  21 #include "content/child/child_thread_impl.h"
  22 #include "content/common/content_export.h"
  23 #include "content/common/frame_replication_state.h"
  24 #include "content/common/gpu/client/gpu_channel_host.h"
  25 #include "content/common/gpu/gpu_result_codes.h"
  26 #include "content/public/renderer/render_thread.h"
  27 #include "content/renderer/gpu/compositor_dependencies.h"
  28 #include "net/base/network_change_notifier.h"
  29 #include "third_party/WebKit/public/platform/WebConnectionType.h"
  30 #include "ui/gfx/native_widget_types.h"
  31
  32 #if defined(OS_MACOSX)
  33 #include "third_party/WebKit/public/web/mac/WebScrollbarTheme.h"
  34 #endif
  35
  36 class GrContext;
  37 class SkBitmap;
  38 struct FrameMsg_NewFrame_WidgetParams;
  39 struct ViewMsg_New_Params;
  40 struct WorkerProcessMsg_CreateWorker_Params;
  41
  42 namespace blink {
  43 class WebGamepads;
  44 class WebGraphicsContext3D;
  45 class WebMediaStreamCenter;
  46 class WebMediaStreamCenterClient;
  47 }
  48
  49 namespace base {
  50 class MessageLoopProxy;
  51 class SingleThreadTaskRunner;
  52 class Thread;
  53 }
  54
  55 namespace cc {
  56 class ContextProvider;
  57 class TaskGraphRunner;
  58 }
  59
  60 namespace cc_blink {
  61 class ContextProviderWebContext;
  62 }
  63
  64 namespace IPC {
  65 class MessageFilter;
  66 }
  67
  68 namespace media {
  69 class AudioHardwareConfig;
  70 class GpuVideoAcceleratorFactories;
  71 }
  72
  73 namespace scheduler {
  74 class RendererScheduler;
  75 }
  76
  77 namespace v8 {
  78 class Extension;
  79 }
  80
  81 namespace content {
  82
  83 class AppCacheDispatcher;
  84 class AecDumpMessageFilter;
  85 class AudioInputMessageFilter;
  86 class AudioMessageFilter;
  87 class AudioRendererMixerManager;
  88 class BrowserPluginManager;
  89 class CacheStorageDispatcher;
  90 class CompositorForwardingMessageFilter;
  91 class ContextProviderCommandBuffer;
  92 class DBMessageFilter;
  93 class DevToolsAgentFilter;
  94 class DomStorageDispatcher;
  95 class EmbeddedWorkerDispatcher;
  96 class GpuChannelHost;
  97 class IndexedDBDispatcher;
  98 class InputHandlerManager;
  99 class MediaStreamCenter;
 100 class MemoryObserver;
 101 class MidiMessageFilter;
 102 class NetInfoDispatcher;
 103 class P2PSocketDispatcher;
 104 class PeerConnectionDependencyFactory;
 105 class PeerConnectionTracker;
 106 class RenderProcessObserver;
 107 class RendererBlinkPlatformImpl;
 108 class RendererDemuxerAndroid;
 109 class ResourceDispatchThrottler;
 110 class ResourceSchedulingFilter;
 111 class V8SamplingProfiler;
 112 class VideoCaptureImplManager;
 113 class WebGraphicsContext3DCommandBufferImpl;
 114 class WebRTCIdentityService;
 115
 116 #if defined(COMPILER_MSVC)
 117 // See explanation for other RenderViewHostImpl which is the same issue.
 118 #pragma warning(push)
 119 #pragma warning(disable: 4250)
 120 #endif
 121
 122 // The RenderThreadImpl class represents a background thread where RenderView
 123 // instances live.  The RenderThread supports an API that is used by its
 124 // consumer to talk indirectly to the RenderViews and supporting objects.
 125 // Likewise, it provides an API for the RenderViews to talk back to the main
 126 // process (i.e., their corresponding WebContentsImpl).
 127 //
 128 // Most of the communication occurs in the form of IPC messages.  They are
 129 // routed to the RenderThread according to the routing IDs of the messages.
 130 // The routing IDs correspond to RenderView instances.
 131 class CONTENT_EXPORT RenderThreadImpl
 132     : public RenderThread,
 133       public ChildThreadImpl,
 134       public GpuChannelHostFactory,
 135       NON_EXPORTED_BASE(public CompositorDependencies) {
 136  public:
 137   static RenderThreadImpl* current();
 138
 139   explicit RenderThreadImpl(const InProcessChildThreadParams& params);
 140   explicit RenderThreadImpl(scoped_ptr<base::MessageLoop> main_message_loop);
 141   ~RenderThreadImpl() override;
 142   void Shutdown() override;
 143
 144   // When initializing WebKit, ensure that any schemes needed for the content
 145   // module are registered properly.  Static to allow sharing with tests.
 146   static void RegisterSchemes();
 147
 148   // Notify V8 that the date/time configuration of the system might have
 149   // changed.
 150   static void NotifyTimezoneChange();
 151
 152   // RenderThread implementation:
 153   bool Send(IPC::Message* msg) override;
 154   scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() override;
 155   IPC::SyncChannel* GetChannel() override;
 156   std::string GetLocale() override;
 157   IPC::SyncMessageFilter* GetSyncMessageFilter() override;
 158   scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() override;
 159   void AddRoute(int32 routing_id, IPC::Listener* listener) override;
 160   void RemoveRoute(int32 routing_id) override;
 161   int GenerateRoutingID() override;
 162   void AddFilter(IPC::MessageFilter* filter) override;
 163   void RemoveFilter(IPC::MessageFilter* filter) override;
 164   void AddObserver(RenderProcessObserver* observer) override;
 165   void RemoveObserver(RenderProcessObserver* observer) override;
 166   void SetResourceDispatcherDelegate(
 167       ResourceDispatcherDelegate* delegate) override;
 168   void EnsureWebKitInitialized() override;
 169   void RecordAction(const base::UserMetricsAction& action) override;
 170   void RecordComputedAction(const std::string& action) override;
 171   scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
 172       size_t buffer_size) override;
 173   cc::SharedBitmapManager* GetSharedBitmapManager() override;
 174   void RegisterExtension(v8::Extension* extension) override;
 175   void ScheduleIdleHandler(int64 initial_delay_ms) override;
 176   void IdleHandler() override;
 177   int64 GetIdleNotificationDelayInMs() const override;
 178   void SetIdleNotificationDelayInMs(
 179       int64 idle_notification_delay_in_ms) override;
 180   void UpdateHistograms(int sequence_number) override;
 181   int PostTaskToAllWebWorkers(const base::Closure& closure) override;
 182   bool ResolveProxy(const GURL& url, std::string* proxy_list) override;
 183   base::WaitableEvent* GetShutdownEvent() override;
 184   ServiceRegistry* GetServiceRegistry() override;
 185
 186   // CompositorDependencies implementation.
 187   bool IsImplSidePaintingEnabled() override;
 188   bool IsGpuRasterizationForced() override;
 189   bool IsGpuRasterizationEnabled() override;
 190   int GetGpuRasterizationMSAASampleCount() override;
 191   bool IsLcdTextEnabled() override;
 192   bool IsDistanceFieldTextEnabled() override;
 193   bool IsZeroCopyEnabled() override;
 194   bool IsOneCopyEnabled() override;
 195   bool IsElasticOverscrollEnabled() override;
 196   bool UseSingleThreadScheduler() override;
 197   uint32 GetImageTextureTarget() override;
 198   scoped_refptr<base::SingleThreadTaskRunner>
 199   GetCompositorMainThreadTaskRunner() override;
 200   scoped_refptr<base::SingleThreadTaskRunner>
 201   GetCompositorImplThreadTaskRunner() override;
 202   gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
 203   scheduler::RendererScheduler* GetRendererScheduler() override;
 204   cc::ContextProvider* GetSharedMainThreadContextProvider() override;
 205   scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
 206       int routing_id) override;
 207   cc::TaskGraphRunner* GetTaskGraphRunner() override;
 208   bool IsGatherPixelRefsEnabled() override;
 209
 210   // Synchronously establish a channel to the GPU plugin if not previously
 211   // established or if it has been lost (for example if the GPU plugin crashed).
 212   // If there is a pending asynchronous request, it will be completed by the
 213   // time this routine returns.
 214   GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch);
 215
 216
 217   // These methods modify how the next message is sent.  Normally, when sending
 218   // a synchronous message that runs a nested message loop, we need to suspend
 219   // callbacks into WebKit.  This involves disabling timers and deferring
 220   // resource loads.  However, there are exceptions when we need to customize
 221   // the behavior.
 222   void DoNotSuspendWebKitSharedTimer();
 223   void DoNotNotifyWebKitOfModalLoop();
 224
 225   // True if we are running layout tests. This currently disables forwarding
 226   // various status messages to the console, skips network error pages, and
 227   // short circuits size update and focus events.
 228   bool layout_test_mode() const {
 229     return layout_test_mode_;
 230   }
 231   void set_layout_test_mode(bool layout_test_mode) {
 232     layout_test_mode_ = layout_test_mode;
 233   }
 234
 235   RendererBlinkPlatformImpl* blink_platform_impl() const {
 236     DCHECK(blink_platform_impl_);
 237     return blink_platform_impl_.get();
 238   }
 239
 240   CompositorForwardingMessageFilter* compositor_message_filter() const {
 241     return compositor_message_filter_.get();
 242   }
 243
 244   InputHandlerManager* input_handler_manager() const {
 245     return input_handler_manager_.get();
 246   }
 247
 248   // Will be null if threaded compositing has not been enabled.
 249   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy() const {
 250     return compositor_message_loop_proxy_;
 251   }
 252
 253   AppCacheDispatcher* appcache_dispatcher() const {
 254     return appcache_dispatcher_.get();
 255   }
 256
 257   DomStorageDispatcher* dom_storage_dispatcher() const {
 258     return dom_storage_dispatcher_.get();
 259   }
 260
 261   EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
 262     return embedded_worker_dispatcher_.get();
 263   }
 264
 265   AudioInputMessageFilter* audio_input_message_filter() {
 266     return audio_input_message_filter_.get();
 267   }
 268
 269   AudioMessageFilter* audio_message_filter() {
 270     return audio_message_filter_.get();
 271   }
 272
 273   MidiMessageFilter* midi_message_filter() {
 274     return midi_message_filter_.get();
 275   }
 276
 277 #if defined(OS_ANDROID)
 278   RendererDemuxerAndroid* renderer_demuxer() {
 279     return renderer_demuxer_.get();
 280   }
 281 #endif
 282
 283   // Creates the embedder implementation of WebMediaStreamCenter.
 284   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
 285   blink::WebMediaStreamCenter* CreateMediaStreamCenter(
 286       blink::WebMediaStreamCenterClient* client);
 287
 288   BrowserPluginManager* browser_plugin_manager() const {
 289     return browser_plugin_manager_.get();
 290   }
 291
 292 #if defined(ENABLE_WEBRTC)
 293   // Returns a factory used for creating RTC PeerConnection objects.
 294   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
 295
 296   PeerConnectionTracker* peer_connection_tracker() {
 297     return peer_connection_tracker_.get();
 298   }
 299
 300   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
 301   P2PSocketDispatcher* p2p_socket_dispatcher() {
 302     return p2p_socket_dispatcher_.get();
 303   }
 304 #endif
 305
 306   VideoCaptureImplManager* video_capture_impl_manager() const {
 307     return vc_manager_.get();
 308   }
 309
 310   // Get the GPU channel. Returns NULL if the channel is not established or
 311   // has been lost.
 312   GpuChannelHost* GetGpuChannel();
 313
 314   // Returns a MessageLoopProxy instance corresponding to the message loop
 315   // of the thread on which file operations should be run. Must be called
 316   // on the renderer's main thread.
 317   scoped_refptr<base::MessageLoopProxy> GetFileThreadMessageLoopProxy();
 318
 319   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
 320   // of the thread on which media operations should be run. Must be called
 321   // on the renderer's main thread.
 322   scoped_refptr<base::SingleThreadTaskRunner> GetMediaThreadTaskRunner();
 323
 324   // Causes the idle handler to skip sending idle notifications
 325   // on the two next scheduled calls, so idle notifications are
 326   // not sent for at least one notification delay.
 327   void PostponeIdleNotification();
 328
 329   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
 330
 331   scoped_refptr<cc_blink::ContextProviderWebContext>
 332   SharedMainThreadContextProvider();
 333
 334   // AudioRendererMixerManager instance which manages renderer side mixer
 335   // instances shared based on configured audio parameters.  Lazily created on
 336   // first call.
 337   AudioRendererMixerManager* GetAudioRendererMixerManager();
 338
 339   // AudioHardwareConfig contains audio hardware configuration for
 340   // renderer side clients.  Creation requires a synchronous IPC call so it is
 341   // lazily created on the first call.
 342   media::AudioHardwareConfig* GetAudioHardwareConfig();
 343
 344 #if defined(OS_WIN)
 345   void PreCacheFontCharacters(const LOGFONT& log_font,
 346                               const base::string16& str);
 347 #endif
 348
 349 #if defined(ENABLE_WEBRTC)
 350   WebRTCIdentityService* get_webrtc_identity_service() {
 351     return webrtc_identity_service_.get();
 352   }
 353 #endif
 354
 355   // For producing custom V8 histograms. Custom histograms are produced if all
 356   // RenderViews share the same host, and the host is in the pre-specified set
 357   // of hosts we want to produce custom diagrams for. The name for a custom
 358   // diagram is the name of the corresponding generic diagram plus a
 359   // host-specific suffix.
 360   class CONTENT_EXPORT HistogramCustomizer {
 361    public:
 362     HistogramCustomizer();
 363     ~HistogramCustomizer();
 364
 365     // Called when a top frame of a RenderView navigates. This function updates
 366     // RenderThreadImpl's information about whether all RenderViews are
 367     // displaying a page from the same host. |host| is the host where a
 368     // RenderView navigated, and |view_count| is the number of RenderViews in
 369     // this process.
 370     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
 371
 372     // Used for customizing some histograms if all RenderViews share the same
 373     // host. Returns the current custom histogram name to use for
 374     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
 375     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
 376
 377    private:
 378     friend class RenderThreadImplUnittest;
 379
 380     // Used for updating the information on which is the common host which all
 381     // RenderView's share (if any). If there is no common host, this function is
 382     // called with an empty string.
 383     void SetCommonHost(const std::string& host);
 384
 385     // The current common host of the RenderViews; empty string if there is no
 386     // common host.
 387     std::string common_host_;
 388     // The corresponding suffix.
 389     std::string common_host_histogram_suffix_;
 390     // Set of histograms for which we want to produce a custom histogram if
 391     // possible.
 392     std::set<std::string> custom_histograms_;
 393
 394     DISALLOW_COPY_AND_ASSIGN(HistogramCustomizer);
 395   };
 396
 397   HistogramCustomizer* histogram_customizer() {
 398     return &histogram_customizer_;
 399   }
 400
 401   // Retrieve current gamepad data.
 402   void SampleGamepads(blink::WebGamepads* data);
 403
 404   // Called by a RenderWidget when it is created or destroyed. This
 405   // allows the process to know when there are no visible widgets.
 406   void WidgetCreated();
 407   // Note: A widget must not be hidden when it is destroyed - ensure that
 408   // WidgetRestored is called before WidgetDestroyed for any hidden widget.
 409   void WidgetDestroyed();
 410   void WidgetHidden();
 411   void WidgetRestored();
 412
 413   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
 414   void RemoveEmbeddedWorkerRoute(int32 routing_id);
 415
 416   void RegisterPendingRenderFrameConnect(
 417       int routing_id,
 418       mojo::InterfaceRequest<mojo::ServiceProvider> services,
 419       mojo::ServiceProviderPtr exposed_services);
 420
 421  protected:
 422   virtual void SetResourceDispatchTaskQueue(
 423     const scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue);
 424
 425  private:
 426   // ChildThread
 427   bool OnControlMessageReceived(const IPC::Message& msg) override;
 428
 429   // GpuChannelHostFactory implementation:
 430   bool IsMainThread() override;
 431   base::MessageLoop* GetMainLoop() override;
 432   scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() override;
 433   scoped_ptr<base::SharedMemory> AllocateSharedMemory(size_t size) override;
 434   CreateCommandBufferResult CreateViewCommandBuffer(
 435       int32 surface_id,
 436       const GPUCreateCommandBufferConfig& init_params,
 437       int32 route_id) override;
 438
 439   void Init();
 440
 441   void OnCreateNewFrame(int routing_id,
 442                         int parent_routing_id,
 443                         int proxy_routing_id,
 444                         const FrameReplicationState& replicated_state,
 445                         FrameMsg_NewFrame_WidgetParams params);
 446   void OnCreateNewFrameProxy(int routing_id,
 447                              int parent_routing_id,
 448                              int render_view_routing_id,
 449                              const FrameReplicationState& replicated_state);
 450   void OnSetZoomLevelForCurrentURL(const std::string& scheme,
 451                                    const std::string& host,
 452                                    double zoom_level);
 453   void OnCreateNewView(const ViewMsg_New_Params& params);
 454   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
 455 #if defined(ENABLE_PLUGINS)
 456   void OnPurgePluginListCache(bool reload_pages);
 457 #endif
 458   void OnNetworkTypeChanged(net::NetworkChangeNotifier::ConnectionType type);
 459   void OnGetAccessibilityTree();
 460   void OnTempCrashWithData(const GURL& data);
 461   void OnUpdateTimezone();
 462   void OnMemoryPressure(
 463       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 464 #if defined(OS_ANDROID)
 465   void OnSetWebKitSharedTimersSuspended(bool suspend);
 466 #endif
 467 #if defined(OS_MACOSX)
 468   void OnUpdateScrollbarTheme(float initial_button_delay,
 469                               float autoscroll_button_delay,
 470                               bool jump_on_track_click,
 471                               blink::ScrollerStyle preferred_scroller_style,
 472                               bool redraw);
 473 #endif
 474   void OnCreateNewSharedWorker(
 475       const WorkerProcessMsg_CreateWorker_Params& params);
 476   bool RendererIsHidden() const;
 477   void OnRendererHidden();
 478   void OnRendererVisible();
 479
 480   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateOffscreenContext3d();
 481
 482   // These objects live solely on the render thread.
 483   scoped_ptr<AppCacheDispatcher> appcache_dispatcher_;
 484   scoped_ptr<DomStorageDispatcher> dom_storage_dispatcher_;
 485   scoped_ptr<IndexedDBDispatcher> main_thread_indexed_db_dispatcher_;
 486   scoped_ptr<scheduler::RendererScheduler> renderer_scheduler_;
 487   scoped_ptr<RendererBlinkPlatformImpl> blink_platform_impl_;
 488   scoped_ptr<ResourceDispatchThrottler> resource_dispatch_throttler_;
 489   scoped_ptr<CacheStorageDispatcher> main_thread_cache_storage_dispatcher_;
 490   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
 491
 492   // Used on the render thread and deleted by WebKit at shutdown.
 493   blink::WebMediaStreamCenter* media_stream_center_;
 494
 495   // Used on the renderer and IPC threads.
 496   scoped_refptr<DBMessageFilter> db_message_filter_;
 497   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
 498   scoped_refptr<AudioMessageFilter> audio_message_filter_;
 499   scoped_refptr<MidiMessageFilter> midi_message_filter_;
 500 #if defined(OS_ANDROID)
 501   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
 502 #endif
 503   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
 504   scoped_ptr<V8SamplingProfiler> v8_sampling_profiler_;
 505
 506   scoped_ptr<BrowserPluginManager> browser_plugin_manager_;
 507
 508 #if defined(ENABLE_WEBRTC)
 509   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
 510
 511   // This is used to communicate to the browser process the status
 512   // of all the peer connections created in the renderer.
 513   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
 514
 515   // Dispatches all P2P sockets.
 516   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
 517 #endif
 518
 519   // Used on the render thread.
 520   scoped_ptr<VideoCaptureImplManager> vc_manager_;
 521
 522   // Used for communicating registering AEC dump consumers with the browser and
 523   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
 524   // diagnostic audio data for WebRTC stored locally when enabled by the user in
 525   // chrome://webrtc-internals.
 526   scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
 527
 528   // The count of RenderWidgets running through this thread.
 529   int widget_count_;
 530
 531   // The count of hidden RenderWidgets running through this thread.
 532   int hidden_widget_count_;
 533
 534   // The current value of the idle notification timer delay.
 535   int64 idle_notification_delay_in_ms_;
 536
 537   // The number of idle handler calls that skip sending idle notifications.
 538   int idle_notifications_to_skip_;
 539
 540   bool suspend_webkit_shared_timer_;
 541   bool notify_webkit_of_modal_loop_;
 542   bool webkit_shared_timer_suspended_;
 543
 544   // The following flag is used to control layout test specific behavior.
 545   bool layout_test_mode_;
 546
 547   // Timer that periodically calls IdleHandler.
 548   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
 549
 550   // The channel from the renderer process to the GPU process.
 551   scoped_refptr<GpuChannelHost> gpu_channel_;
 552
 553   // Cache of variables that are needed on the compositor thread by
 554   // GpuChannelHostFactory methods.
 555   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 556
 557   // The message loop of the renderer main thread.
 558   // This message loop should be destructed before the RenderThreadImpl
 559   // shuts down Blink.
 560   scoped_ptr<base::MessageLoop> main_message_loop_;
 561
 562   // A lazily initiated thread on which file operations are run.
 563   scoped_ptr<base::Thread> file_thread_;
 564
 565   // May be null if overridden by ContentRendererClient.
 566   scoped_ptr<base::Thread> compositor_thread_;
 567
 568   // Thread for running multimedia operations (e.g., video decoding).
 569   scoped_ptr<base::Thread> media_thread_;
 570
 571   // Will point to appropriate MessageLoopProxy after initialization,
 572   // regardless of whether |compositor_thread_| is overriden.
 573   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy_;
 574
 575   // Threads used by compositor for rasterization.
 576   ScopedVector<base::SimpleThread> compositor_raster_threads_;
 577
 578   base::CancelableCallback<void(const IPC::Message&)> main_input_callback_;
 579   scoped_refptr<IPC::MessageFilter> input_event_filter_;
 580   scoped_ptr<InputHandlerManager> input_handler_manager_;
 581   scoped_refptr<CompositorForwardingMessageFilter> compositor_message_filter_;
 582
 583   scoped_refptr<cc_blink::ContextProviderWebContext>
 584       shared_main_thread_contexts_;
 585
 586   ObserverList<RenderProcessObserver> observers_;
 587
 588   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
 589
 590   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
 591   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 592
 593   HistogramCustomizer histogram_customizer_;
 594
 595   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 596
 597 #if defined(ENABLE_WEBRTC)
 598   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 599 #endif
 600
 601   scoped_ptr<MemoryObserver> memory_observer_;
 602
 603   scoped_refptr<base::SingleThreadTaskRunner>
 604       main_thread_compositor_task_runner_;
 605
 606   scoped_refptr<ResourceSchedulingFilter> resource_scheduling_filter_;
 607
 608   scoped_ptr<cc::TaskGraphRunner> compositor_task_graph_runner_;
 609
 610   // Compositor settings.
 611   bool is_gpu_rasterization_enabled_;
 612   bool is_gpu_rasterization_forced_;
 613   int gpu_rasterization_msaa_sample_count_;
 614   bool is_impl_side_painting_enabled_;
 615   bool is_lcd_text_enabled_;
 616   bool is_distance_field_text_enabled_;
 617   bool is_zero_copy_enabled_;
 618   bool is_one_copy_enabled_;
 619   bool is_elastic_overscroll_enabled_;
 620   unsigned use_image_texture_target_;
 621   bool is_gather_pixel_refs_enabled_;
 622
 623   class PendingRenderFrameConnect
 624       : public base::RefCounted<PendingRenderFrameConnect>,
 625         public mojo::ErrorHandler {
 626    public:
 627     PendingRenderFrameConnect(
 628         int routing_id,
 629         mojo::InterfaceRequest<mojo::ServiceProvider> services,
 630         mojo::ServiceProviderPtr exposed_services);
 631
 632     mojo::InterfaceRequest<mojo::ServiceProvider>& services() {
 633       return services_;
 634     }
 635
 636     mojo::ServiceProviderPtr& exposed_services() { return exposed_services_; }
 637
 638    private:
 639     friend class base::RefCounted<PendingRenderFrameConnect>;
 640
 641     ~PendingRenderFrameConnect() override;
 642
 643     void OnConnectionError() override;
 644
 645     int routing_id_;
 646     mojo::InterfaceRequest<mojo::ServiceProvider> services_;
 647     mojo::ServiceProviderPtr exposed_services_;
 648   };
 649
 650   typedef std::map<int, scoped_refptr<PendingRenderFrameConnect>>
 651       PendingRenderFrameConnectMap;
 652   PendingRenderFrameConnectMap pending_render_frame_connects_;
 653
 654   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 655 };
 656
 657 #if defined(COMPILER_MSVC)
 658 #pragma warning(pop)
 659 #endif
 660
 661 }  // namespace content
 662
 663 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_