media: Make GpuMemoryBuffers VideoFrame copies asynchronous.

media/base/renderer_factory.h

 // Copyright 2014 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 MEDIA_BASE_RENDERER_FACTORY_H_
 #define MEDIA_BASE_RENDERER_FACTORY_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 #include "media/base/renderer.h"
 
 namespace base {
 class SingleThreadTaskRunner;
+class TaskRunner;
 }
 
 namespace media {
 
 class AudioRendererSink;
 class VideoRendererSink;
 
 // A factory class for creating media::Renderer to be used by media pipeline.
 class MEDIA_EXPORT RendererFactory {
  public:
   RendererFactory();
   virtual ~RendererFactory();
 
   // Creates and returns a Renderer. All methods of the created Renderer except
   // for GetMediaTime() will be called on the |media_task_runner|.
   // GetMediaTime() could be called on any thread.
   // The created Renderer can use |audio_renderer_sink| to render audio and
   // |video_renderer_sink| to render video.
   virtual scoped_ptr<Renderer> CreateRenderer(
       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
+      const scoped_refptr<base::TaskRunner>& worker_task_runner,
       AudioRendererSink* audio_renderer_sink,
       VideoRendererSink* video_renderer_sink) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RendererFactory);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_RENDERER_FACTORY_H_