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 SingleThreadTaskRunner;
  47 class Thread;
  48 }
  49
  50 namespace cc {
  51 class ContextProvider;
  52 }
  53
  54 namespace IPC {
  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 CompositorForwardingMessageFilter;
  82 class ContextProviderCommandBuffer;
  83 class DBMessageFilter;
  84 class DevToolsAgentFilter;
  85 class DomStorageDispatcher;
  86 class EmbeddedWorkerDispatcher;
  87 class GpuChannelHost;
  88 class IndexedDBDispatcher;
  89 class InputEventFilter;
  90 class InputHandlerManager;
  91 class MediaStreamCenter;
  92 class MemoryObserver;
  93 class PeerConnectionDependencyFactory;
  94 class MidiMessageFilter;
  95 class NetInfoDispatcher;
  96 class P2PSocketDispatcher;
  97 class PeerConnectionTracker;
  98 class RenderProcessObserver;
  99 class RendererBlinkPlatformImpl;
 100 class RendererDemuxerAndroid;
 101 class RendererScheduler;
 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   // Constructor that's used in RendererMain.
 125   explicit RenderThreadImpl(scoped_ptr<base::MessageLoop> main_message_loop);
 126   ~RenderThreadImpl() override;
 127   void Shutdown() override;
 128
 129   // When initializing WebKit, ensure that any schemes needed for the content
 130   // module are registered properly.  Static to allow sharing with tests.
 131   static void RegisterSchemes();
 132
 133   // Notify V8 that the date/time configuration of the system might have
 134   // changed.
 135   static void NotifyTimezoneChange();
 136
 137   // RenderThread implementation:
 138   bool Send(IPC::Message* msg) override;
 139   base::MessageLoop* GetMessageLoop() override;
 140   IPC::SyncChannel* GetChannel() override;
 141   std::string GetLocale() override;
 142   IPC::SyncMessageFilter* GetSyncMessageFilter() override;
 143   scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() override;
 144   void AddRoute(int32 routing_id, IPC::Listener* listener) override;
 145   void RemoveRoute(int32 routing_id) override;
 146   int GenerateRoutingID() override;
 147   void AddFilter(IPC::MessageFilter* filter) override;
 148   void RemoveFilter(IPC::MessageFilter* filter) override;
 149   void AddObserver(RenderProcessObserver* observer) override;
 150   void RemoveObserver(RenderProcessObserver* observer) override;
 151   void SetResourceDispatcherDelegate(
 152       ResourceDispatcherDelegate* delegate) override;
 153   void EnsureWebKitInitialized() override;
 154   void RecordAction(const base::UserMetricsAction& action) override;
 155   void RecordComputedAction(const std::string& action) override;
 156   scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
 157       size_t buffer_size) override;
 158   void RegisterExtension(v8::Extension* extension) override;
 159   void ScheduleIdleHandler(int64 initial_delay_ms) override;
 160   void IdleHandler() override;
 161   int64 GetIdleNotificationDelayInMs() const override;
 162   void SetIdleNotificationDelayInMs(
 163       int64 idle_notification_delay_in_ms) override;
 164   void UpdateHistograms(int sequence_number) override;
 165   int PostTaskToAllWebWorkers(const base::Closure& closure) override;
 166   bool ResolveProxy(const GURL& url, std::string* proxy_list) override;
 167   base::WaitableEvent* GetShutdownEvent() override;
 168 #if defined(OS_WIN)
 169   virtual void PreCacheFont(const LOGFONT& log_font) override;
 170   virtual void ReleaseCachedFonts() override;
 171 #endif
 172   ServiceRegistry* GetServiceRegistry() override;
 173
 174   // Synchronously establish a channel to the GPU plugin if not previously
 175   // established or if it has been lost (for example if the GPU plugin crashed).
 176   // If there is a pending asynchronous request, it will be completed by the
 177   // time this routine returns.
 178   GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch);
 179
 180
 181   // These methods modify how the next message is sent.  Normally, when sending
 182   // a synchronous message that runs a nested message loop, we need to suspend
 183   // callbacks into WebKit.  This involves disabling timers and deferring
 184   // resource loads.  However, there are exceptions when we need to customize
 185   // the behavior.
 186   void DoNotSuspendWebKitSharedTimer();
 187   void DoNotNotifyWebKitOfModalLoop();
 188
 189   // True if we are running layout tests. This currently disables forwarding
 190   // various status messages to the console, skips network error pages, and
 191   // short circuits size update and focus events.
 192   bool layout_test_mode() const {
 193     return layout_test_mode_;
 194   }
 195   void set_layout_test_mode(bool layout_test_mode) {
 196     layout_test_mode_ = layout_test_mode;
 197   }
 198
 199   RendererScheduler* renderer_scheduler() const {
 200     DCHECK(renderer_scheduler_);
 201     return renderer_scheduler_.get();
 202   }
 203
 204   RendererBlinkPlatformImpl* blink_platform_impl() const {
 205     DCHECK(blink_platform_impl_);
 206     return blink_platform_impl_.get();
 207   }
 208
 209   scoped_refptr<base::SingleThreadTaskRunner>
 210   main_thread_compositor_task_runner() const {
 211     return main_thread_compositor_task_runner_;
 212   }
 213
 214   CompositorForwardingMessageFilter* compositor_message_filter() const {
 215     return compositor_message_filter_.get();
 216   }
 217
 218   InputHandlerManager* input_handler_manager() const {
 219     return input_handler_manager_.get();
 220   }
 221
 222   // Will be NULL if threaded compositing has not been enabled.
 223   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy() const {
 224     return compositor_message_loop_proxy_;
 225   }
 226
 227   bool is_gpu_rasterization_enabled() const {
 228     return is_gpu_rasterization_enabled_;
 229   }
 230
 231   bool is_gpu_rasterization_forced() const {
 232     return is_gpu_rasterization_forced_;
 233   }
 234
 235   bool is_impl_side_painting_enabled() const {
 236     return is_impl_side_painting_enabled_;
 237   }
 238
 239   bool is_lcd_text_enabled() const { return is_lcd_text_enabled_; }
 240
 241   bool is_distance_field_text_enabled() const {
 242     return is_distance_field_text_enabled_;
 243   }
 244
 245   bool is_zero_copy_enabled() const { return is_zero_copy_enabled_; }
 246
 247   bool is_one_copy_enabled() const { return is_one_copy_enabled_; }
 248
 249   bool use_image_external() const { return use_image_external_; }
 250
 251   AppCacheDispatcher* appcache_dispatcher() const {
 252     return appcache_dispatcher_.get();
 253   }
 254
 255   DomStorageDispatcher* dom_storage_dispatcher() const {
 256     return dom_storage_dispatcher_.get();
 257   }
 258
 259   EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
 260     return embedded_worker_dispatcher_.get();
 261   }
 262
 263   AudioInputMessageFilter* audio_input_message_filter() {
 264     return audio_input_message_filter_.get();
 265   }
 266
 267   AudioMessageFilter* audio_message_filter() {
 268     return audio_message_filter_.get();
 269   }
 270
 271   MidiMessageFilter* midi_message_filter() {
 272     return midi_message_filter_.get();
 273   }
 274
 275 #if defined(OS_ANDROID)
 276   RendererDemuxerAndroid* renderer_demuxer() {
 277     return renderer_demuxer_.get();
 278   }
 279 #endif
 280
 281   // Creates the embedder implementation of WebMediaStreamCenter.
 282   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
 283   blink::WebMediaStreamCenter* CreateMediaStreamCenter(
 284       blink::WebMediaStreamCenterClient* client);
 285
 286 #if defined(ENABLE_WEBRTC)
 287   // Returns a factory used for creating RTC PeerConnection objects.
 288   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
 289
 290   PeerConnectionTracker* peer_connection_tracker() {
 291     return peer_connection_tracker_.get();
 292   }
 293
 294   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
 295   P2PSocketDispatcher* p2p_socket_dispatcher() {
 296     return p2p_socket_dispatcher_.get();
 297   }
 298 #endif
 299
 300   VideoCaptureImplManager* video_capture_impl_manager() const {
 301     return vc_manager_.get();
 302   }
 303
 304   // Get the GPU channel. Returns NULL if the channel is not established or
 305   // has been lost.
 306   GpuChannelHost* GetGpuChannel();
 307
 308   // Returns a MessageLoopProxy instance corresponding to the message loop
 309   // of the thread on which file operations should be run. Must be called
 310   // on the renderer's main thread.
 311   scoped_refptr<base::MessageLoopProxy> GetFileThreadMessageLoopProxy();
 312
 313   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
 314   // of the thread on which media operations should be run. Must be called
 315   // on the renderer's main thread.
 316   scoped_refptr<base::SingleThreadTaskRunner> GetMediaThreadTaskRunner();
 317
 318   // Causes the idle handler to skip sending idle notifications
 319   // on the two next scheduled calls, so idle notifications are
 320   // not sent for at least one notification delay.
 321   void PostponeIdleNotification();
 322
 323   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
 324
 325   scoped_refptr<webkit::gpu::ContextProviderWebContext>
 326       SharedMainThreadContextProvider();
 327
 328   // AudioRendererMixerManager instance which manages renderer side mixer
 329   // instances shared based on configured audio parameters.  Lazily created on
 330   // first call.
 331   AudioRendererMixerManager* GetAudioRendererMixerManager();
 332
 333   // AudioHardwareConfig contains audio hardware configuration for
 334   // renderer side clients.  Creation requires a synchronous IPC call so it is
 335   // lazily created on the first call.
 336   media::AudioHardwareConfig* GetAudioHardwareConfig();
 337
 338 #if defined(OS_WIN)
 339   void PreCacheFontCharacters(const LOGFONT& log_font,
 340                               const base::string16& str);
 341 #endif
 342
 343 #if defined(ENABLE_WEBRTC)
 344   WebRTCIdentityService* get_webrtc_identity_service() {
 345     return webrtc_identity_service_.get();
 346   }
 347 #endif
 348
 349   // For producing custom V8 histograms. Custom histograms are produced if all
 350   // RenderViews share the same host, and the host is in the pre-specified set
 351   // of hosts we want to produce custom diagrams for. The name for a custom
 352   // diagram is the name of the corresponding generic diagram plus a
 353   // host-specific suffix.
 354   class CONTENT_EXPORT HistogramCustomizer {
 355    public:
 356     HistogramCustomizer();
 357     ~HistogramCustomizer();
 358
 359     // Called when a top frame of a RenderView navigates. This function updates
 360     // RenderThreadImpl's information about whether all RenderViews are
 361     // displaying a page from the same host. |host| is the host where a
 362     // RenderView navigated, and |view_count| is the number of RenderViews in
 363     // this process.
 364     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
 365
 366     // Used for customizing some histograms if all RenderViews share the same
 367     // host. Returns the current custom histogram name to use for
 368     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
 369     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
 370
 371    private:
 372     friend class RenderThreadImplUnittest;
 373
 374     // Used for updating the information on which is the common host which all
 375     // RenderView's share (if any). If there is no common host, this function is
 376     // called with an empty string.
 377     void SetCommonHost(const std::string& host);
 378
 379     // The current common host of the RenderViews; empty string if there is no
 380     // common host.
 381     std::string common_host_;
 382     // The corresponding suffix.
 383     std::string common_host_histogram_suffix_;
 384     // Set of histograms for which we want to produce a custom histogram if
 385     // possible.
 386     std::set<std::string> custom_histograms_;
 387
 388     DISALLOW_COPY_AND_ASSIGN(HistogramCustomizer);
 389   };
 390
 391   HistogramCustomizer* histogram_customizer() {
 392     return &histogram_customizer_;
 393   }
 394
 395   // Retrieve current gamepad data.
 396   void SampleGamepads(blink::WebGamepads* data);
 397
 398   // Called by a RenderWidget when it is created or destroyed. This
 399   // allows the process to know when there are no visible widgets.
 400   void WidgetCreated();
 401   void WidgetDestroyed();
 402   void WidgetHidden();
 403   void WidgetRestored();
 404
 405   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
 406   void RemoveEmbeddedWorkerRoute(int32 routing_id);
 407
 408   void RegisterPendingRenderFrameConnect(int routing_id,
 409                                          mojo::ScopedMessagePipeHandle handle);
 410
 411  private:
 412   // ChildThread
 413   bool OnControlMessageReceived(const IPC::Message& msg) override;
 414
 415   // GpuChannelHostFactory implementation:
 416   bool IsMainThread() override;
 417   base::MessageLoop* GetMainLoop() override;
 418   scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() override;
 419   scoped_ptr<base::SharedMemory> AllocateSharedMemory(size_t size) override;
 420   CreateCommandBufferResult CreateViewCommandBuffer(
 421       int32 surface_id,
 422       const GPUCreateCommandBufferConfig& init_params,
 423       int32 route_id) override;
 424
 425   void Init();
 426
 427   void OnCreateNewFrame(int routing_id,
 428                         int parent_routing_id,
 429                         int proxy_routing_id);
 430   void OnCreateNewFrameProxy(int routing_id,
 431                              int parent_routing_id,
 432                              int render_view_routing_id);
 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 #if defined(ENABLE_PLUGINS)
 439   void OnPurgePluginListCache(bool reload_pages);
 440 #endif
 441   void OnNetworkTypeChanged(net::NetworkChangeNotifier::ConnectionType type);
 442   void OnGetAccessibilityTree();
 443   void OnTempCrashWithData(const GURL& data);
 444   void OnUpdateTimezone();
 445   void OnMemoryPressure(
 446       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 447 #if defined(OS_ANDROID)
 448   void OnSetWebKitSharedTimersSuspended(bool suspend);
 449 #endif
 450 #if defined(OS_MACOSX)
 451   void OnUpdateScrollbarTheme(float initial_button_delay,
 452                               float autoscroll_button_delay,
 453                               bool jump_on_track_click,
 454                               blink::ScrollerStyle preferred_scroller_style,
 455                               bool redraw);
 456 #endif
 457   void OnCreateNewSharedWorker(
 458       const WorkerProcessMsg_CreateWorker_Params& params);
 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<RendererScheduler> renderer_scheduler_;
 467   scoped_ptr<RendererBlinkPlatformImpl> blink_platform_impl_;
 468   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
 469
 470   // Used on the render thread and deleted by WebKit at shutdown.
 471   blink::WebMediaStreamCenter* media_stream_center_;
 472
 473   // Used on the renderer and IPC threads.
 474   scoped_refptr<DBMessageFilter> db_message_filter_;
 475   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
 476   scoped_refptr<AudioMessageFilter> audio_message_filter_;
 477   scoped_refptr<MidiMessageFilter> midi_message_filter_;
 478 #if defined(OS_ANDROID)
 479   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
 480 #endif
 481   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
 482
 483 #if defined(ENABLE_WEBRTC)
 484   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
 485
 486   // This is used to communicate to the browser process the status
 487   // of all the peer connections created in the renderer.
 488   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
 489
 490   // Dispatches all P2P sockets.
 491   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
 492 #endif
 493
 494   // Used on the render thread.
 495   scoped_ptr<VideoCaptureImplManager> vc_manager_;
 496
 497   // Used for communicating registering AEC dump consumers with the browser and
 498   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
 499   // diagnostic audio data for WebRTC stored locally when enabled by the user in
 500   // chrome://webrtc-internals.
 501   scoped_refptr<AecDumpMessageFilter> aec_dump_message_filter_;
 502
 503   // The count of RenderWidgets running through this thread.
 504   int widget_count_;
 505
 506   // The count of hidden RenderWidgets running through this thread.
 507   int hidden_widget_count_;
 508
 509   // The current value of the idle notification timer delay.
 510   int64 idle_notification_delay_in_ms_;
 511
 512   // The number of idle handler calls that skip sending idle notifications.
 513   int idle_notifications_to_skip_;
 514
 515   bool suspend_webkit_shared_timer_;
 516   bool notify_webkit_of_modal_loop_;
 517   bool webkit_shared_timer_suspended_;
 518
 519   // The following flag is used to control layout test specific behavior.
 520   bool layout_test_mode_;
 521
 522   // Timer that periodically calls IdleHandler.
 523   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
 524
 525   // The channel from the renderer process to the GPU process.
 526   scoped_refptr<GpuChannelHost> gpu_channel_;
 527
 528   // Cache of variables that are needed on the compositor thread by
 529   // GpuChannelHostFactory methods.
 530   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 531
 532   // The message loop of the renderer main thread.
 533   // This message loop should be destructed before the RenderThreadImpl
 534   // shuts down Blink.
 535   scoped_ptr<base::MessageLoop> main_message_loop_;
 536
 537   // A lazily initiated thread on which file operations are run.
 538   scoped_ptr<base::Thread> file_thread_;
 539
 540   // May be null if overridden by ContentRendererClient.
 541   scoped_ptr<base::Thread> compositor_thread_;
 542
 543   // Thread for running multimedia operations (e.g., video decoding).
 544   scoped_ptr<base::Thread> media_thread_;
 545
 546   // Will point to appropriate MessageLoopProxy after initialization,
 547   // regardless of whether |compositor_thread_| is overriden.
 548   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy_;
 549
 550   // May be null if unused by the |input_handler_manager_|.
 551   scoped_refptr<InputEventFilter> input_event_filter_;
 552   scoped_ptr<InputHandlerManager> input_handler_manager_;
 553   scoped_refptr<CompositorForwardingMessageFilter> compositor_message_filter_;
 554
 555   scoped_refptr<webkit::gpu::ContextProviderWebContext>
 556       shared_main_thread_contexts_;
 557
 558   ObserverList<RenderProcessObserver> observers_;
 559
 560   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
 561
 562   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
 563   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 564
 565   HistogramCustomizer histogram_customizer_;
 566
 567   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 568
 569 #if defined(ENABLE_WEBRTC)
 570   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 571 #endif
 572
 573   scoped_ptr<MemoryObserver> memory_observer_;
 574
 575   scoped_refptr<base::SingleThreadTaskRunner>
 576       main_thread_compositor_task_runner_;
 577
 578   // Compositor settings
 579   bool is_gpu_rasterization_enabled_;
 580   bool is_gpu_rasterization_forced_;
 581   bool is_impl_side_painting_enabled_;
 582   bool is_lcd_text_enabled_;
 583   bool is_distance_field_text_enabled_;
 584   bool is_zero_copy_enabled_;
 585   bool is_one_copy_enabled_;
 586   bool use_image_external_;
 587
 588   std::map<int, mojo::MessagePipeHandle> pending_render_frame_connects_;
 589
 590   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 591 };
 592
 593 }  // namespace content
 594
 595 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_