Implement video frame acknowledgements in the chromoting protocol.

remoting/host/mouse_clamping_filter.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/mouse_clamping_filter.h"
 
 #include "remoting/proto/event.pb.h"
 #include "remoting/proto/video.pb.h"
 
 namespace remoting {
 
 MouseClampingFilter::MouseClampingFilter(
     protocol::InputStub* input_stub)
     : input_filter_(input_stub),
-      video_stub_(nullptr) {
+      video_sender_(nullptr) {
 }
 
 MouseClampingFilter::~MouseClampingFilter() {
 }
 
 void MouseClampingFilter::ProcessVideoPacket(
     scoped_ptr<VideoPacket> video_packet,
     const base::Closure& done) {
   // Configure the MouseInputFilter to clamp to the video dimensions.
   if (video_packet->format().has_screen_width() &&
       video_packet->format().has_screen_height()) {
     webrtc::DesktopSize screen_size =
         webrtc::DesktopSize(video_packet->format().screen_width(),
                             video_packet->format().screen_height());
     input_filter_.set_input_size(screen_size);
     input_filter_.set_output_size(screen_size);
   }
 
-  video_stub_->ProcessVideoPacket(video_packet.Pass(), done);
+  video_sender_->ProcessVideoPacket(video_packet.Pass(), done);
+}
+
+bool MouseClampingFilter::SupportsAcks() {
+  return video_sender_->SupportsAcks();
 }
 
 }  // namespace remoting