Add client and host dispatchers for video_stats channel to send video stats from host to client.

remoting/protocol/video_stats_stub.h

+// 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.
+
+#ifndef REMOTING_PROTOCOL_VIDEO_STATE_STUB_H_
+#define REMOTING_PROTOCOL_VIDEO_STATE_STUB_H_
+
+#include <cstdint>
+
+#include "base/macros.h"
+
+namespace remoting {
+namespace protocol {
+
+struct HostFrameStats;
+
+// Interface used to send video frame stats from host to client.
+class VideoStatsStub {
+ public:
+  virtual void OnVideoFrameStats(uint32_t frame_id,
+                                 const HostFrameStats& frame_stats) = 0;
+
+ protected:
+  VideoStatsStub() {}
+  virtual ~VideoStatsStub() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoStatsStub);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_VIDEO_SSTATE_TUB_H_