Implement video frame acknowledgements in the chromoting protocol.

remoting/host/mouse_clamping_filter.cc

Index: remoting/host/mouse_clamping_filter.cc
diff --git a/remoting/host/mouse_clamping_filter.cc b/remoting/host/mouse_clamping_filter.cc
index d9c545a3e2a9730420e541a9007321abbe7f4565..74cf87607eb28e096245385aa0c55a4d0c4bdebc 100644
--- a/remoting/host/mouse_clamping_filter.cc
+++ b/remoting/host/mouse_clamping_filter.cc
@@ -12,7 +12,7 @@ namespace remoting {
 MouseClampingFilter::MouseClampingFilter(
     protocol::InputStub* input_stub)
     : input_filter_(input_stub),
-      video_stub_(nullptr) {
+      video_sender_(nullptr) {
 }
 
 MouseClampingFilter::~MouseClampingFilter() {
@@ -31,7 +31,11 @@ void MouseClampingFilter::ProcessVideoPacket(
     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