Implement client-side video stream support for WebRTC-based protocol.

remoting/protocol/webrtc_transport_unittest.cc

Index: remoting/protocol/webrtc_transport_unittest.cc
diff --git a/remoting/protocol/webrtc_transport_unittest.cc b/remoting/protocol/webrtc_transport_unittest.cc
index 737f2914fd7c2365923c3fbb496dcda95e09a3da..b4e3ec60c1f95d90bf9370c5b269f63733cf8560 100644
--- a/remoting/protocol/webrtc_transport_unittest.cc
+++ b/remoting/protocol/webrtc_transport_unittest.cc
@@ -60,6 +60,10 @@ class TestTransportEventHandler : public WebrtcTransport::EventHandler {
   void OnWebrtcTransportError(ErrorCode error) override {
     error_callback_.Run(error);
   }
+  void OnWebrtcTransportMediaStreamAdded(
+      scoped_refptr<webrtc::MediaStreamInterface> stream) override {}
+  void OnWebrtcTransportMediaStreamRemoved(
+      scoped_refptr<webrtc::MediaStreamInterface> stream) override {}
 
  private:
   base::Closure connecting_callback_;