Make WebRtcVideoChannel2::WebRtcVideoSendStream implement rtc::VideoRendererInterface.

talk/app/webrtc/rtpsenderreceiver_unittest.cc

 /*
  * 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 75 matching lines @@
   MOCK_METHOD2(SetCaptureDevice,
                bool(uint32_t ssrc, cricket::VideoCapturer* camera));
   MOCK_METHOD3(SetVideoPlayout,
                void(uint32_t ssrc,
                     bool enable,
                     cricket::VideoRenderer* renderer));
   MOCK_METHOD3(SetVideoSend,
                void(uint32_t ssrc,
                     bool enable,
                     const cricket::VideoOptions* options));
+  rtc::VideoSinkInterface<cricket::VideoFrame>* GetSink(
+      uint32_t ssrc) override {
+    return NULL;
+  }
 };
 
 class FakeVideoSource : public Notifier<VideoSourceInterface> {
  public:
   static rtc::scoped_refptr<FakeVideoSource> Create(bool remote) {
     return new rtc::RefCountedObject<FakeVideoSource>(remote);
   }
   virtual cricket::VideoCapturer* GetVideoCapturer() { return &fake_capturer_; }
   virtual void Stop() {}
   virtual void Restart() {}
@@ skipping 399 matching lines @@
                                video_track_->GetSource()->GetVideoCapturer()));
   EXPECT_CALL(video_provider_, SetVideoSend(kVideoSsrc2, true, _));
   sender->SetSsrc(kVideoSsrc2);
 
   // Calls expected from destructor.
   EXPECT_CALL(video_provider_, SetCaptureDevice(kVideoSsrc2, nullptr)).Times(1);
   EXPECT_CALL(video_provider_, SetVideoSend(kVideoSsrc2, false, _)).Times(1);
 }
 
 }  // namespace webrtc