Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/host_video_dispatcher.h

Index: remoting/protocol/host_video_dispatcher.h
diff --git a/remoting/protocol/host_video_dispatcher.h b/remoting/protocol/host_video_dispatcher.h
index c1a957397c0ab6a018f12b8414df98a84b55bc9d..79d15855618cf6b2b6aac29a81529eb69788f7ab 100644
--- a/remoting/protocol/host_video_dispatcher.h
+++ b/remoting/protocol/host_video_dispatcher.h
@@ -5,26 +5,37 @@
 #ifndef REMOTING_PROTOCOL_HOST_VIDEO_DISPATCHER_H_
 #define REMOTING_PROTOCOL_HOST_VIDEO_DISPATCHER_H_
 
-#include <string>
-
 #include "base/compiler_specific.h"
-#include "remoting/protocol/buffered_socket_writer.h"
+#include "remoting/proto/video.pb.h"
 #include "remoting/protocol/channel_dispatcher_base.h"
+#include "remoting/protocol/protobuf_message_parser.h"
 #include "remoting/protocol/video_stub.h"
 
 namespace remoting {
 namespace protocol {
 
+class VideoFeedbackStub;
+
 class HostVideoDispatcher : public ChannelDispatcherBase, public VideoStub {
  public:
   HostVideoDispatcher();
   ~HostVideoDispatcher() override;
 
+  void set_video_feedback_stub(VideoFeedbackStub* video_feedback_stub) {
+    video_feedback_stub_ = video_feedback_stub;
+  }
+
   // VideoStub interface.
   void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
                           const base::Closure& done) override;
 
  private:
+  void OnVideoAck(scoped_ptr<VideoAck> ack, const base::Closure& done);
+
+  ProtobufMessageParser<VideoAck> parser_;
+
+  VideoFeedbackStub* video_feedback_stub_;
+
   DISALLOW_COPY_AND_ASSIGN(HostVideoDispatcher);
 };