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_Params;
  39 struct ViewMsg_New_Params;
  40 struct ViewMsg_UpdateScrollbarTheme_Params;
  41 struct WorkerProcessMsg_CreateWorker_Params;
  42
  43 namespace blink {
  44 class WebGamepads;
  45 class WebGraphicsContext3D;
  46 class WebMediaStreamCenter;
  47 class WebMediaStreamCenterClient;
  48 }
  49
  50 namespace base {
  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 BluetoothMessageFilter;
  89 class BrowserPluginManager;
  90 class CacheStorageDispatcher;
  91 class CompositorForwardingMessageFilter;
  92 class ContextProviderCommandBuffer;
  93 class DBMessageFilter;
  94 class DevToolsAgentFilter;
  95 class DomStorageDispatcher;
  96 class EmbeddedWorkerDispatcher;
  97 class GpuChannelHost;
  98 class IndexedDBDispatcher;
  99 class InputHandlerManager;
 100 class MediaStreamCenter;
 101 class MemoryObserver;
 102 class MidiMessageFilter;
 103 class NetInfoDispatcher;
 104 class P2PSocketDispatcher;
 105 class PeerConnectionDependencyFactory;
 106 class PeerConnectionTracker;
 107 class RasterWorkerPool;
 108 class RenderProcessObserver;
 109 class RendererBlinkPlatformImpl;
 110 class RendererDemuxerAndroid;
 111 class ResourceDispatchThrottler;
 112 class ResourceSchedulingFilter;
 113 class V8SamplingProfiler;
 114 class VideoCaptureImplManager;
 115 class WebGraphicsContext3DCommandBufferImpl;
 116 class WebRTCIdentityService;
 117
 118 #if defined(COMPILER_MSVC)
 119 // See explanation for other RenderViewHostImpl which is the same issue.
 120 #pragma warning(push)
 121 #pragma warning(disable: 4250)
 122 #endif
 123
 124 // The RenderThreadImpl class represents a background thread where RenderView
 125 // instances live.  The RenderThread supports an API that is used by its
 126 // consumer to talk indirectly to the RenderViews and supporting objects.
 127 // Likewise, it provides an API for the RenderViews to talk back to the main
 128 // process (i.e., their corresponding WebContentsImpl).
 129 //
 130 // Most of the communication occurs in the form of IPC messages.  They are
 131 // routed to the RenderThread according to the routing IDs of the messages.
 132 // The routing IDs correspond to RenderView instances.
 133 class CONTENT_EXPORT RenderThreadImpl
 134     : public RenderThread,
 135       public ChildThreadImpl,
 136       public GpuChannelHostFactory,
 137       NON_EXPORTED_BASE(public CompositorDependencies) {
 138  public:
 139   static RenderThreadImpl* Create(const InProcessChildThreadParams& params);
 140   static RenderThreadImpl* Create(
 141       scoped_ptr<base::MessageLoop> main_message_loop,
 142       scoped_ptr<scheduler::RendererScheduler> renderer_scheduler);
 143   static RenderThreadImpl* current();
 144
 145   ~RenderThreadImpl() override;
 146   void Shutdown() override;
 147
 148   // When initializing WebKit, ensure that any schemes needed for the content
 149   // module are registered properly.  Static to allow sharing with tests.
 150   static void RegisterSchemes();
 151
 152   // Notify V8 that the date/time configuration of the system might have
 153   // changed.
 154   static void NotifyTimezoneChange();
 155
 156   // RenderThread implementation:
 157   bool Send(IPC::Message* msg) override;
 158   IPC::SyncChannel* GetChannel() override;
 159   std::string GetLocale() override;
 160   IPC::SyncMessageFilter* GetSyncMessageFilter() override;
 161   scoped_refptr<base::SingleThreadTaskRunner> GetIOMessageLoopProxy() override;
 162   void AddRoute(int32 routing_id, IPC::Listener* listener) override;
 163   void RemoveRoute(int32 routing_id) override;
 164   int GenerateRoutingID() override;
 165   void AddFilter(IPC::MessageFilter* filter) override;
 166   void RemoveFilter(IPC::MessageFilter* filter) override;
 167   void AddObserver(RenderProcessObserver* observer) override;
 168   void RemoveObserver(RenderProcessObserver* observer) override;
 169   void SetResourceDispatcherDelegate(
 170       ResourceDispatcherDelegate* delegate) override;
 171   void EnsureWebKitInitialized() override;
 172   void RecordAction(const base::UserMetricsAction& action) override;
 173   void RecordComputedAction(const std::string& action) override;
 174   scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
 175       size_t buffer_size) override;
 176   cc::SharedBitmapManager* GetSharedBitmapManager() override;
 177   void RegisterExtension(v8::Extension* extension) override;
 178   void ScheduleIdleHandler(int64 initial_delay_ms) override;
 179   void IdleHandler() override;
 180   int64 GetIdleNotificationDelayInMs() const override;
 181   void SetIdleNotificationDelayInMs(
 182       int64 idle_notification_delay_in_ms) override;
 183   void UpdateHistograms(int sequence_number) override;
 184   int PostTaskToAllWebWorkers(const base::Closure& closure) override;
 185   bool ResolveProxy(const GURL& url, std::string* proxy_list) override;
 186   base::WaitableEvent* GetShutdownEvent() override;
 187   ServiceRegistry* GetServiceRegistry() override;
 188
 189   // CompositorDependencies implementation.
 190   bool IsGpuRasterizationForced() override;
 191   bool IsGpuRasterizationEnabled() override;
 192   int GetGpuRasterizationMSAASampleCount() override;
 193   bool IsLcdTextEnabled() override;
 194   bool IsDistanceFieldTextEnabled() override;
 195   bool IsZeroCopyEnabled() override;
 196   bool IsPersistentGpuMemoryBufferEnabled() override;
 197   bool IsElasticOverscrollEnabled() override;
 198   std::vector<unsigned> GetImageTextureTargets() override;
 199   scoped_refptr<base::SingleThreadTaskRunner>
 200   GetCompositorMainThreadTaskRunner() override;
 201   scoped_refptr<base::SingleThreadTaskRunner>
 202   GetCompositorImplThreadTaskRunner() override;
 203   gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
 204   scheduler::RendererScheduler* GetRendererScheduler() override;
 205   cc::ContextProvider* GetSharedMainThreadContextProvider() override;
 206   scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
 207       int routing_id) override;
 208   cc::TaskGraphRunner* GetTaskGraphRunner() override;
 209   bool IsGatherPixelRefsEnabled() override;
 210   bool IsThreadedAnimationEnabled() override;
 211
 212   // Synchronously establish a channel to the GPU plugin if not previously
 213   // established or if it has been lost (for example if the GPU plugin crashed).
 214   // If there is a pending asynchronous request, it will be completed by the
 215   // time this routine returns.
 216   GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch);
 217
 218
 219   // This method modifies how the next message is sent.  Normally, when sending
 220   // a synchronous message that runs a nested message loop, we need to suspend
 221   // callbacks into WebKit.  This involves disabling timers and deferring
 222   // resource loads.  However, there are exceptions when we need to customize
 223   // the behavior.
 224   void DoNotNotifyWebKitOfModalLoop();
 225
 226   // True if we are running layout tests. This currently disables forwarding
 227   // various status messages to the console, skips network error pages, and
 228   // short circuits size update and focus events.
 229   bool layout_test_mode() const {
 230     return layout_test_mode_;
 231   }
 232   void set_layout_test_mode(bool layout_test_mode) {
 233     layout_test_mode_ = layout_test_mode;
 234   }
 235
 236   RendererBlinkPlatformImpl* blink_platform_impl() const {
 237     DCHECK(blink_platform_impl_);
 238     return blink_platform_impl_.get();
 239   }
 240
 241   CompositorForwardingMessageFilter* compositor_message_filter() const {
 242     return compositor_message_filter_.get();
 243   }
 244
 245   InputHandlerManager* input_handler_manager() const {
 246     return input_handler_manager_.get();
 247   }
 248
 249   // Will be null if threaded compositing has not been enabled.
 250   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner() const {
 251     return compositor_task_runner_;
 252   }
 253
 254   AppCacheDispatcher* appcache_dispatcher() const {
 255     return appcache_dispatcher_.get();
 256   }
 257
 258   DomStorageDispatcher* dom_storage_dispatcher() const {
 259     return dom_storage_dispatcher_.get();
 260   }
 261
 262   EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
 263     return embedded_worker_dispatcher_.get();
 264   }
 265
 266   AudioInputMessageFilter* audio_input_message_filter() {
 267     return audio_input_message_filter_.get();
 268   }
 269
 270   AudioMessageFilter* audio_message_filter() {
 271     return audio_message_filter_.get();
 272   }
 273
 274   MidiMessageFilter* midi_message_filter() {
 275     return midi_message_filter_.get();
 276   }
 277
 278 #if defined(OS_ANDROID)
 279   RendererDemuxerAndroid* renderer_demuxer() {
 280     return renderer_demuxer_.get();
 281   }
 282 #endif
 283
 284   // Creates the embedder implementation of WebMediaStreamCenter.
 285   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
 286   blink::WebMediaStreamCenter* CreateMediaStreamCenter(
 287       blink::WebMediaStreamCenterClient* client);
 288
 289   BrowserPluginManager* browser_plugin_manager() const {
 290     return browser_plugin_manager_.get();
 291   }
 292
 293 #if defined(ENABLE_WEBRTC)
 294   // Returns a factory used for creating RTC PeerConnection objects.
 295   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
 296
 297   PeerConnectionTracker* peer_connection_tracker() {
 298     return peer_connection_tracker_.get();
 299   }
 300
 301   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
 302   P2PSocketDispatcher* p2p_socket_dispatcher() {
 303     return p2p_socket_dispatcher_.get();
 304   }
 305 #endif
 306
 307   VideoCaptureImplManager* video_capture_impl_manager() const {
 308     return vc_manager_.get();
 309   }
 310
 311   // Get the GPU channel. Returns NULL if the channel is not established or
 312   // has been lost.
 313   GpuChannelHost* GetGpuChannel();
 314
 315   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
 316   // of the thread on which file operations should be run. Must be called
 317   // on the renderer's main thread.
 318   scoped_refptr<base::SingleThreadTaskRunner> GetFileThreadMessageLoopProxy();
 319
 320   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
 321   // of the thread on which media operations should be run. Must be called
 322   // on the renderer's main thread.
 323   scoped_refptr<base::SingleThreadTaskRunner> GetMediaThreadTaskRunner();
 324
 325   // A TaskRunner instance that runs tasks on the raster worker pool.
 326   base::TaskRunner* GetWorkerTaskRunner();
 327
 328   // Causes the idle handler to skip sending idle notifications
 329   // on the two next scheduled calls, so idle notifications are
 330   // not sent for at least one notification delay.
 331   void PostponeIdleNotification();
 332
 333   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
 334
 335   scoped_refptr<cc_blink::ContextProviderWebContext>
 336   SharedMainThreadContextProvider();
 337
 338   // AudioRendererMixerManager instance which manages renderer side mixer
 339   // instances shared based on configured audio parameters.  Lazily created on
 340   // first call.
 341   AudioRendererMixerManager* GetAudioRendererMixerManager();
 342
 343   // AudioHardwareConfig contains audio hardware configuration for
 344   // renderer side clients.  Creation requires a synchronous IPC call so it is
 345   // lazily created on the first call.
 346   media::AudioHardwareConfig* GetAudioHardwareConfig();
 347
 348 #if defined(OS_WIN)
 349   void PreCacheFontCharacters(const LOGFONT& log_font,
 350                               const base::string16& str);
 351 #endif
 352
 353 #if defined(ENABLE_WEBRTC)
 354   WebRTCIdentityService* get_webrtc_identity_service() {
 355     return webrtc_identity_service_.get();
 356   }
 357 #endif
 358
 359   // For producing custom V8 histograms. Custom histograms are produced if all
 360   // RenderViews share the same host, and the host is in the pre-specified set
 361   // of hosts we want to produce custom diagrams for. The name for a custom
 362   // diagram is the name of the corresponding generic diagram plus a
 363   // host-specific suffix.
 364   class CONTENT_EXPORT HistogramCustomizer {
 365    public:
 366     HistogramCustomizer();
 367     ~HistogramCustomizer();
 368
 369     // Called when a top frame of a RenderView navigates. This function updates
 370     // RenderThreadImpl's information about whether all RenderViews are
 371     // displaying a page from the same host. |host| is the host where a
 372     // RenderView navigated, and |view_count| is the number of RenderViews in
 373     // this process.
 374     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
 375
 376     // Used for customizing some histograms if all RenderViews share the same
 377     // host. Returns the current custom histogram name to use for
 378     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
 379     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
 380
 381    private:
 382     friend class RenderThreadImplUnittest;
 383
 384     // Used for updating the information on which is the common host which all
 385     // RenderView's share (if any). If there is no common host, this function is
 386     // called with an empty string.
 387     void SetCommonHost(const std::string& host);
 388
 389     // The current common host of the RenderViews; empty string if there is no
 390     // common host.
 391     std::string common_host_;
 392     // The corresponding suffix.
 393     std::string common_host_histogram_suffix_;
 394     // Set of histograms for which we want to produce a custom histogram if
 395     // possible.
 396     std::set<std::string> custom_histograms_;
 397
 398     DISALLOW_COPY_AND_ASSIGN(HistogramCustomizer);
 399   };
 400
 401   HistogramCustomizer* histogram_customizer() {
 402     return &histogram_customizer_;
 403   }
 404
 405   // Retrieve current gamepad data.
 406   void SampleGamepads(blink::WebGamepads* data);
 407
 408   // Called by a RenderWidget when it is created or destroyed. This
 409   // allows the process to know when there are no visible widgets.
 410   void WidgetCreated();
 411   // Note: A widget must not be hidden when it is destroyed - ensure that
 412   // WidgetRestored is called before WidgetDestroyed for any hidden widget.
 413   void WidgetDestroyed();
 414   void WidgetHidden();
 415   void WidgetRestored();
 416
 417   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
 418   void RemoveEmbeddedWorkerRoute(int32 routing_id);
 419
 420   void RegisterPendingRenderFrameConnect(
 421       int routing_id,
 422       mojo::InterfaceRequest<mojo::ServiceProvider> services,
 423       mojo::ServiceProviderPtr exposed_services);
 424
 425  protected:
 426   RenderThreadImpl(const InProcessChildThreadParams& params,
 427                    scoped_ptr<scheduler::RendererScheduler> scheduler);
 428   RenderThreadImpl(scoped_ptr<base::MessageLoop> main_message_loop,
 429                    scoped_ptr<scheduler::RendererScheduler> scheduler);
 430   virtual void SetResourceDispatchTaskQueue(
 431     const scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue);
 432
 433  private:
 434   // ChildThread
 435   bool OnControlMessageReceived(const IPC::Message& msg) override;
 436   void OnProcessBackgrounded(bool backgrounded) override;
 437
 438   // GpuChannelHostFactory implementation:
 439   bool IsMainThread() override;
 440   scoped_refptr<base::SingleThreadTaskRunner> GetIOThreadTaskRunner() override;
 441   scoped_ptr<base::SharedMemory> AllocateSharedMemory(size_t size) override;
 442   CreateCommandBufferResult CreateViewCommandBuffer(
 443       int32 surface_id,
 444       const GPUCreateCommandBufferConfig& init_params,
 445       int32 route_id) override;
 446
 447   void Init();
 448
 449   void OnCreateNewFrame(FrameMsg_NewFrame_Params params);
 450   void OnCreateNewFrameProxy(int routing_id,
 451                              int render_view_routing_id,
 452                              int opener_routing_id,
 453                              int parent_routing_id,
 454                              const FrameReplicationState& replicated_state);
 455   void OnSetZoomLevelForCurrentURL(const std::string& scheme,
 456                                    const std::string& host,
 457                                    double zoom_level);
 458   void OnCreateNewView(const ViewMsg_New_Params& params);
 459   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
 460 #if defined(ENABLE_PLUGINS)
 461   void OnPurgePluginListCache(bool reload_pages);
 462 #endif
 463   void OnNetworkConnectionChanged(
 464       net::NetworkChangeNotifier::ConnectionType type,
 465       double max_bandwidth_mbps);
 466   void OnGetAccessibilityTree();
 467   void OnUpdateTimezone(const std::string& zoneId);
 468   void OnMemoryPressure(
 469       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 470 #if defined(OS_ANDROID)
 471   void OnSetWebKitSharedTimersSuspended(bool suspend);
 472 #endif
 473 #if defined(OS_MACOSX)
 474   void OnUpdateScrollbarTheme(
 475       const ViewMsg_UpdateScrollbarTheme_Params& params);
 476 #endif
 477   void OnCreateNewSharedWorker(
 478       const WorkerProcessMsg_CreateWorker_Params& params);
 479   bool RendererIsHidden() const;
 480   void OnRendererHidden();
 481   void OnRendererVisible();
 482
 483   void ReleaseFreeMemory();
 484
 485   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateOffscreenContext3d();
 486
 487   // These objects live solely on the render thread.
 488   scoped_ptr<AppCacheDispatcher> appcache_dispatcher_;
 489   scoped_ptr<DomStorageDispatcher> dom_storage_dispatcher_;
 490   scoped_ptr<IndexedDBDispatcher> main_thread_indexed_db_dispatcher_;
 491   scoped_ptr<scheduler::RendererScheduler> renderer_scheduler_;
 492   scoped_ptr<RendererBlinkPlatformImpl> blink_platform_impl_;
 493   scoped_ptr<ResourceDispatchThrottler> resource_dispatch_throttler_;
 494   scoped_ptr<CacheStorageDispatcher> main_thread_cache_storage_dispatcher_;
 495   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
 496
 497   // Used on the render thread and deleted by WebKit at shutdown.
 498   blink::WebMediaStreamCenter* media_stream_center_;
 499
 500   // Used on the renderer and IPC threads.
 501   scoped_refptr<DBMessageFilter> db_message_filter_;
 502   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
 503   scoped_refptr<AudioMessageFilter> audio_message_filter_;
 504   scoped_refptr<MidiMessageFilter> midi_message_filter_;
 505 #if defined(OS_ANDROID)
 506   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
 507 #endif
 508   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
 509   scoped_ptr<V8SamplingProfiler> v8_sampling_profiler_;
 510
 511   scoped_ptr<BrowserPluginManager> browser_plugin_manager_;
 512
 513 #if defined(ENABLE_WEBRTC)
 514   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
 515
 516   // This is used to communicate to the browser process the status
 517   // of all the peer connections created in the renderer.
 518   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
 519
 520   // Dispatches all P2P sockets.
 521   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
 522 #endif
 523
 524   // Used on the render thread.
 525   scoped_ptr<VideoCaptureImplManager> vc_manager_;
 526
 527   // Used for communicating registering AEC dump consumers with the browser and
 528   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
 529   // diagnostic audio data for WebRTC stored locally when enabled by the user in
 530   // chrome://webrtc-internals.
 531   scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
 532
 533   // The count of RenderWidgets running through this thread.
 534   int widget_count_;
 535
 536   // The count of hidden RenderWidgets running through this thread.
 537   int hidden_widget_count_;
 538
 539   // The current value of the idle notification timer delay.
 540   int64 idle_notification_delay_in_ms_;
 541
 542   // The number of idle handler calls that skip sending idle notifications.
 543   int idle_notifications_to_skip_;
 544
 545   bool notify_webkit_of_modal_loop_;
 546   bool webkit_shared_timer_suspended_;
 547
 548   // The following flag is used to control layout test specific behavior.
 549   bool layout_test_mode_;
 550
 551   // Timer that periodically calls IdleHandler.
 552   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
 553
 554   // The channel from the renderer process to the GPU process.
 555   scoped_refptr<GpuChannelHost> gpu_channel_;
 556
 557   // Cache of variables that are needed on the compositor thread by
 558   // GpuChannelHostFactory methods.
 559   scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
 560
 561   // The message loop of the renderer main thread.
 562   // This message loop should be destructed before the RenderThreadImpl
 563   // shuts down Blink.
 564   scoped_ptr<base::MessageLoop> main_message_loop_;
 565
 566   // A lazily initiated thread on which file operations are run.
 567   scoped_ptr<base::Thread> file_thread_;
 568
 569   // May be null if overridden by ContentRendererClient.
 570   scoped_ptr<base::Thread> compositor_thread_;
 571
 572   // Thread for running multimedia operations (e.g., video decoding).
 573   scoped_ptr<base::Thread> media_thread_;
 574
 575   // Will point to appropriate task runner after initialization,
 576   // regardless of whether |compositor_thread_| is overriden.
 577   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
 578
 579   // Pool of workers used for raster operations (e.g., tile rasterization).
 580   scoped_refptr<RasterWorkerPool> raster_worker_pool_;
 581
 582   base::CancelableCallback<void(const IPC::Message&)> main_input_callback_;
 583   scoped_refptr<IPC::MessageFilter> input_event_filter_;
 584   scoped_ptr<InputHandlerManager> input_handler_manager_;
 585   scoped_refptr<CompositorForwardingMessageFilter> compositor_message_filter_;
 586
 587   scoped_refptr<BluetoothMessageFilter> bluetooth_message_filter_;
 588
 589   scoped_refptr<cc_blink::ContextProviderWebContext>
 590       shared_main_thread_contexts_;
 591
 592   base::ObserverList<RenderProcessObserver> observers_;
 593
 594   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
 595
 596   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
 597   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 598
 599   HistogramCustomizer histogram_customizer_;
 600
 601   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 602
 603 #if defined(ENABLE_WEBRTC)
 604   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 605 #endif
 606
 607   scoped_ptr<MemoryObserver> memory_observer_;
 608
 609   scoped_refptr<base::SingleThreadTaskRunner>
 610       main_thread_compositor_task_runner_;
 611
 612   scoped_refptr<ResourceSchedulingFilter> resource_scheduling_filter_;
 613
 614   // Compositor settings.
 615   bool is_gpu_rasterization_enabled_;
 616   bool is_gpu_rasterization_forced_;
 617   int gpu_rasterization_msaa_sample_count_;
 618   bool is_lcd_text_enabled_;
 619   bool is_distance_field_text_enabled_;
 620   bool is_zero_copy_enabled_;
 621   bool is_one_copy_enabled_;
 622   bool is_persistent_gpu_memory_buffer_enabled_;
 623   bool is_elastic_overscroll_enabled_;
 624   std::vector<unsigned> use_image_texture_targets_;
 625   bool is_gather_pixel_refs_enabled_;
 626   bool is_threaded_animation_enabled_;
 627
 628   class PendingRenderFrameConnect
 629       : public base::RefCounted<PendingRenderFrameConnect> {
 630    public:
 631     PendingRenderFrameConnect(
 632         int routing_id,
 633         mojo::InterfaceRequest<mojo::ServiceProvider> services,
 634         mojo::ServiceProviderPtr exposed_services);
 635
 636     mojo::InterfaceRequest<mojo::ServiceProvider>& services() {
 637       return services_;
 638     }
 639
 640     mojo::ServiceProviderPtr& exposed_services() { return exposed_services_; }
 641
 642    private:
 643     friend class base::RefCounted<PendingRenderFrameConnect>;
 644
 645     ~PendingRenderFrameConnect();
 646
 647     // Mojo error handler.
 648     void OnConnectionError();
 649
 650     int routing_id_;
 651     mojo::InterfaceRequest<mojo::ServiceProvider> services_;
 652     mojo::ServiceProviderPtr exposed_services_;
 653   };
 654
 655   typedef std::map<int, scoped_refptr<PendingRenderFrameConnect>>
 656       PendingRenderFrameConnectMap;
 657   PendingRenderFrameConnectMap pending_render_frame_connects_;
 658
 659   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 660 };
 661
 662 #if defined(COMPILER_MSVC)
 663 #pragma warning(pop)
 664 #endif
 665
 666 }  // namespace content
 667
 668 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_