Added VideoTrackInterface::GetSink method, for use by VideoRtpReceiver. Get rid of FrameInput.

talk/app/webrtc/videotrack.h

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 29 matching lines @@
 class VideoTrack : public MediaStreamTrack<VideoTrackInterface> {
  public:
   static rtc::scoped_refptr<VideoTrack> Create(
       const std::string& label, VideoSourceInterface* source);
 
   virtual void AddRenderer(VideoRendererInterface* renderer);
   virtual void RemoveRenderer(VideoRendererInterface* renderer);
   virtual VideoSourceInterface* GetSource() const {
     return video_source_.get();
   }
+  rtc::VideoSinkInterface<cricket::VideoFrame>* GetSink() override;
   virtual bool set_enabled(bool enable);
   virtual std::string kind() const;
 
  protected:
   VideoTrack(const std::string& id, VideoSourceInterface* video_source);
   ~VideoTrack();
 
  private:
   VideoTrackRenderers renderers_;
   rtc::scoped_refptr<VideoSourceInterface> video_source_;
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_VIDEOTRACK_H_