[PPAPI] Pepper MediaStream API audio track implementation and example.

ppapi/proxy/media_stream_video_track_resource.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 PPAPI_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_
 #define PPAPI_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 25 matching lines @@
   virtual PP_Var GetId() OVERRIDE;
   virtual PP_Bool HasEnded() OVERRIDE;
   virtual int32_t Configure(uint32_t max_buffered_frames) OVERRIDE;
   virtual int32_t GetFrame(
       PP_Resource* frame,
       scoped_refptr<TrackedCallback> callback) OVERRIDE;
   virtual int32_t RecycleFrame(PP_Resource frame) OVERRIDE;
   virtual void Close() OVERRIDE;
 
   // MediaStreamFrameBuffer::Delegate overrides:
-  virtual void OnNewFrameEnqueued() OVERRIDE;
+  virtual bool OnNewFramePreEnqueued(int32_t index) OVERRIDE;
 
  private:
-  PP_Resource GetVideoFrame();
+  PP_Resource GetVideoFrame(int32_t index);
 
   void ReleaseFrames();
 
   // Allocated frame resources by |GetFrame()|.
   typedef std::map<PP_Resource, scoped_refptr<VideoFrameResource> > FrameMap;
   FrameMap frames_;
 
   PP_Resource* get_frame_output_;
 
   scoped_refptr<TrackedCallback> get_frame_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrackResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_