Integrate VDA with WebRTC.

content/renderer/media/renderer_gpu_video_decoder_factories.h

Index: content/renderer/media/renderer_gpu_video_decoder_factories.h
diff --git a/content/renderer/media/renderer_gpu_video_decoder_factories.h b/content/renderer/media/renderer_gpu_video_decoder_factories.h
index e05dd9af9ff78f0e9f02d9d6f22efbf014637acd..9f31586641db5772288c9b04fa2f3e979ec9a552 100644
--- a/content/renderer/media/renderer_gpu_video_decoder_factories.h
+++ b/content/renderer/media/renderer_gpu_video_decoder_factories.h
@@ -31,9 +31,10 @@ class WebGraphicsContext3DCommandBufferImpl;
 //
 // The public methods of the class can be called from any thread, and are
 // internally trampolined to the appropriate thread.  GPU/GL-related calls go to
-// the constructor-argument loop (mostly that's the compositor thread, or the
-// renderer thread if threaded compositing is disabled), and shmem-related calls
-// go to the render thread.
+// the constructor-argument loop. Typically this is the compositor thread,
+// unless threaded-compositing is disabled, when it'll be the renderer thread,
+// or a special-purpose thread e.g. for WebRTC. shmem-related calls go to the
+// render thread.
 class CONTENT_EXPORT RendererGpuVideoDecoderFactories
     : public media::GpuVideoDecoder::Factories {
  public:
@@ -61,6 +62,9 @@ class CONTENT_EXPORT RendererGpuVideoDecoderFactories
   virtual void Abort() OVERRIDE;
   virtual bool IsAborted() OVERRIDE;
 
+  // Makes a copy of |this|.
+  scoped_refptr<RendererGpuVideoDecoderFactories> Clone();
+
  protected:
   friend class base::RefCountedThreadSafe<RendererGpuVideoDecoderFactories>;
   virtual ~RendererGpuVideoDecoderFactories();