Expose a SequencedTaskRunner that runs tasks on raster threads.

content/renderer/render_thread_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 299 matching lines @@
   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
   // of the thread on which file operations should be run. Must be called
   // on the renderer's main thread.
   scoped_refptr<base::SingleThreadTaskRunner> GetFileThreadMessageLoopProxy();
 
   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
   // of the thread on which media operations should be run. Must be called
   // on the renderer's main thread.
   scoped_refptr<base::SingleThreadTaskRunner> GetMediaThreadTaskRunner();
 
+  // Returns a SequencedTaskRunner instance that runs tasks on worker
+  // |compositor_raster_threads_|.
+  scoped_refptr<base::SequencedTaskRunner> GetWorkerSequencedTaskRunner();
+
   // Causes the idle handler to skip sending idle notifications
   // on the two next scheduled calls, so idle notifications are
   // not sent for at least one notification delay.
   void PostponeIdleNotification();
 
   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
 
   scoped_refptr<cc_blink::ContextProviderWebContext>
   SharedMainThreadContextProvider();
 
@@ skipping 229 matching lines @@
   // Thread for running multimedia operations (e.g., video decoding).
   scoped_ptr<base::Thread> media_thread_;
 
   // Will point to appropriate task runner after initialization,
   // regardless of whether |compositor_thread_| is overriden.
   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
 
   // Threads used by compositor for rasterization.
   ScopedVector<base::SimpleThread> compositor_raster_threads_;
 
+  // Task runner that runs tasks on |compositor_raster_threads_|.
+  scoped_refptr<base::SequencedTaskRunner> worker_task_runner_;
+
   base::CancelableCallback<void(const IPC::Message&)> main_input_callback_;
   scoped_refptr<IPC::MessageFilter> input_event_filter_;
   scoped_ptr<InputHandlerManager> input_handler_manager_;
   scoped_refptr<CompositorForwardingMessageFilter> compositor_message_filter_;
 
   scoped_refptr<cc_blink::ContextProviderWebContext>
       shared_main_thread_contexts_;
 
   base::ObserverList<RenderProcessObserver> observers_;
 
@@ skipping 65 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_