Make RendererGpuVideoDecoderFactories live on arbitrary threads.

content/renderer/media/rtc_video_decoder_factory.h

 // Copyright 2013 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_MEDIA_RTC_VIDEO_DECODER_FACTORY_H_
 #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_FACTORY_H_
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 #include "third_party/libjingle/source/talk/media/webrtc/webrtcvideodecoderfactory.h"
 #include "third_party/webrtc/modules/video_coding/codecs/interface/video_codec_interface.h"
 
 namespace media {
 class GpuVideoDecoderFactories;
 }
 
 namespace webrtc {
 class VideoDecoder;
 }
 
 namespace content {
+class RendererGpuVideoDecoderFactories;
 
+// TODO(wuchengli): add unittest.
 class CONTENT_EXPORT RTCVideoDecoderFactory
     : NON_EXPORTED_BASE(public cricket::WebRtcVideoDecoderFactory) {
  public:
-  RTCVideoDecoderFactory(
-      const scoped_refptr<media::GpuVideoDecoderFactories>& gpu_factories);
+  explicit RTCVideoDecoderFactory(
+      const scoped_refptr<RendererGpuVideoDecoderFactories>& gpu_factories);
   virtual ~RTCVideoDecoderFactory();
 
   // Runs on Chrome_libJingle_WorkerThread. The child thread is blocked while
   // this runs.
   virtual webrtc::VideoDecoder* CreateVideoDecoder(webrtc::VideoCodecType type)
       OVERRIDE;
 
   // Runs on Chrome_libJingle_WorkerThread. The child thread is blocked while
   // this runs.
   virtual void DestroyVideoDecoder(webrtc::VideoDecoder* decoder) OVERRIDE;
 
  private:
-  scoped_refptr<base::MessageLoopProxy> vda_loop_proxy_;
-  scoped_ptr<webrtc::VideoDecoder> decoder_;
+  scoped_refptr<RendererGpuVideoDecoderFactories> gpu_factories_;
 
   DISALLOW_COPY_AND_ASSIGN(RTCVideoDecoderFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_FACTORY_H_