Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/monitored_video_stub.h

Index: remoting/protocol/monitored_video_stub.h
diff --git a/remoting/protocol/monitored_video_stub.h b/remoting/protocol/monitored_video_stub.h
index 33a9b90f38d5a7750de2d18bd9e3cd2e3ecc3ce8..7076cbeebd0ead27bbd7d86fc5e22754d588ea00 100644
--- a/remoting/protocol/monitored_video_stub.h
+++ b/remoting/protocol/monitored_video_stub.h
@@ -40,8 +40,9 @@ class MonitoredVideoStub : public VideoStub {
   ~MonitoredVideoStub() override;
 
   // VideoStub implementation.
-  void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
-                          const base::Closure& done) override;
+  void ProcessVideoPacket(
+      scoped_ptr<VideoPacket> packet,
+      const ProgressCallback& progress_callback) override;
 
  private:
   void OnConnectivityCheckTimeout();