Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/video_feedback_stub.h

Index: remoting/protocol/video_feedback_stub.h
diff --git a/remoting/protocol/video_feedback_stub.h b/remoting/protocol/video_feedback_stub.h
new file mode 100644
index 0000000000000000000000000000000000000000..0bb555722e9c11b0b8b9c1eabcbd07258916dca9
--- /dev/null
+++ b/remoting/protocol/video_feedback_stub.h
@@ -0,0 +1,32 @@
+// Copyright 2015 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.
+
+#ifndef REMOTING_PROTOCOL_VIDEO_FEEDBACK_STUB_H_
+#define REMOTING_PROTOCOL_VIDEO_FEEDBACK_STUB_H_
+
+#include "base/callback_forward.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace remoting {
+
+class VideoAck;
+
+namespace protocol {
+
+class VideoFeedbackStub {
+ public:
+  virtual void ProcessVideoAck(scoped_ptr<VideoAck> video_ack) = 0;
+
+ protected:
+  VideoFeedbackStub() {}
+  virtual ~VideoFeedbackStub() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoFeedbackStub);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_VIDEO_FEEDBACK_STUB_H_