Implement video frame acknowledgements in the chromoting protocol.

remoting/host/mouse_clamping_filter.h

Index: remoting/host/mouse_clamping_filter.h
diff --git a/remoting/host/mouse_clamping_filter.h b/remoting/host/mouse_clamping_filter.h
index 994abbe28a4776b122921b27a0e648a6cf90c36b..12656238b39f4064db059d0cf0805df38c15eaa1 100644
--- a/remoting/host/mouse_clamping_filter.h
+++ b/remoting/host/mouse_clamping_filter.h
@@ -7,33 +7,34 @@
 
 #include "base/compiler_specific.h"
 #include "remoting/protocol/mouse_input_filter.h"
-#include "remoting/protocol/video_stub.h"
+#include "remoting/protocol/video_sender.h"
 
 namespace remoting {
 
-// Filtering VideoStub implementation which configures a MouseInputFilter to
+// Filtering VideoSender implementation which configures a MouseInputFilter to
 // clamp mouse events to fall within the dimensions of the most-recently
 // received video frame.
-class MouseClampingFilter : public protocol::VideoStub {
+class MouseClampingFilter : public protocol::VideoSender {
  public:
   explicit MouseClampingFilter(protocol::InputStub* input_stub);
   ~MouseClampingFilter() override;
 
   protocol::InputStub* input_filter() { return &input_filter_; }
 
-  void set_video_stub(protocol::VideoStub* video_stub) {
-    video_stub_ = video_stub;
+  void set_video_sender(protocol::VideoSender* video_sender) {
+    video_sender_ = video_sender;
   }
 
-  // protocol::VideoStub implementation.
+  // protocol::VideoSender implementation.
   void ProcessVideoPacket(scoped_ptr<VideoPacket> video_packet,
                           const base::Closure& done) override;
+  bool SupportsAcks() override;
 
  private:
   // Clamps mouse event coordinates to the video dimensions.
   protocol::MouseInputFilter input_filter_;
 
-  protocol::VideoStub* video_stub_;
+  protocol::VideoSender* video_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(MouseClampingFilter);
 };