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

remoting/protocol/host_video_stats_dispatcher.h

+// Copyright 2016 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_HOST_VIDEO_STATE_DISPATCHER_H_
+#define REMOTING_PROTOCOL_HOST_VIDEO_STATE_DISPATCHER_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "remoting/protocol/channel_dispatcher_base.h"
+#include "remoting/protocol/video_stats_stub.h"
+
+namespace remoting {
+namespace protocol {
+
+class HostVideoStatsDispatcher : public ChannelDispatcherBase,
+                                 public VideoStatsStub {
+ public:
+  explicit HostVideoStatsDispatcher(const std::string& stream_name);
+  ~HostVideoStatsDispatcher() override;
+
+  // VideoStatsStub interface.
+  void OnVideoFrameStats(uint32_t frame_id,
+                         const HostFrameStats& frame_stats) override;
+
+ private:
+  void OnIncomingMessage(std::unique_ptr<CompoundBuffer> message) override;
+
+  DISALLOW_COPY_AND_ASSIGN(HostVideoStatsDispatcher);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_HOST_VIDEO_STATE_DISPATCHER_H_