Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/connection_to_client.cc

Index: remoting/protocol/connection_to_client.cc
diff --git a/remoting/protocol/connection_to_client.cc b/remoting/protocol/connection_to_client.cc
index 6fd811ed60734297702ca693a5b4f1b6e0c650f7..b026ee342ce144bb8ed1be70bef94ea1f0a3d1e0 100644
--- a/remoting/protocol/connection_to_client.cc
+++ b/remoting/protocol/connection_to_client.cc
@@ -84,6 +84,12 @@ void ConnectionToClient::set_input_stub(protocol::InputStub* input_stub) {
   event_dispatcher_->set_input_stub(input_stub);
 }
 
+void ConnectionToClient::set_video_feedback_stub(
+    VideoFeedbackStub* video_feedback_stub) {
+  DCHECK(CalledOnValidThread());
+  video_dispatcher_->set_video_feedback_stub(video_feedback_stub);
+}
+
 void ConnectionToClient::OnSessionStateChange(Session::State state) {
   DCHECK(CalledOnValidThread());