Make cricket::VideoCapturer implement VideoSourceInterface

talk/app/webrtc/mediastreaminterface.h

Index: talk/app/webrtc/mediastreaminterface.h
diff --git a/talk/app/webrtc/mediastreaminterface.h b/talk/app/webrtc/mediastreaminterface.h
index 8d6feb02ef268a8115985d517e13cd0a40a018a3..2c5db118bfbef6b214ab879c28707e44770de25d 100644
--- a/talk/app/webrtc/mediastreaminterface.h
+++ b/talk/app/webrtc/mediastreaminterface.h
@@ -140,11 +140,19 @@ class VideoSourceInterface;
 
 class VideoTrackInterface : public MediaStreamTrackInterface {
  public:
-  // Register a renderer that will render all frames received on this track.
-  virtual void AddRenderer(VideoRendererInterface* renderer) = 0;
-  // Deregister a renderer.
-  virtual void RemoveRenderer(VideoRendererInterface* renderer) = 0;
-
+  // Backwards compatibility wrappers
+  virtual void AddRenderer(VideoRendererInterface* renderer) {
+    AddSink(renderer);
+  }
+  virtual void RemoveRenderer(VideoRendererInterface* renderer) {
+    RemoveSink(renderer);
+  }
+  // Register a sink that will receive all frames received on this
+  // track. Requires |sink| != nullptr.
+  virtual void AddSink(rtc::VideoSinkInterface<cricket::VideoFrame>* sink) = 0;
+  // Deregister a sink. Tolerates |sink| == nullptr.
+  virtual void RemoveSink(
+      rtc::VideoSinkInterface<cricket::VideoFrame>* sink) = 0;
   virtual VideoSourceInterface* GetSource() const = 0;
 
  protected: