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

remoting/protocol/frame_stats.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_FRAME_STATS_H_
 #define REMOTING_PROTOCOL_FRAME_STATS_H_
 
 #include "base/time/time.h"
 
 namespace remoting {
 
 class VideoPacket;
 class FrameStatsMessage;
 
 namespace protocol {
 
 struct HostFrameStats {
   HostFrameStats();
   HostFrameStats(const HostFrameStats&);
   ~HostFrameStats();
 
   // Extracts timing fields from the |packet|.
   static HostFrameStats GetForVideoPacket(const VideoPacket& packet);
 
+  // Converts FrameStatsMessage protobuf message to HostFrameStats.
+  static HostFrameStats FromFrameStatsMessage(const FrameStatsMessage& message);
+  void ToFrameStatsMessage(FrameStatsMessage* message_out) const;
+
   // Frame Size.
   int frame_size {};
 
   // Set to null for frames that were not sent after a fresh input event.
   base::TimeTicks latest_event_timestamp;
 
   // Set to TimeDelta::Max() when unknown.
   base::TimeDelta capture_delay = base::TimeDelta::Max();
   base::TimeDelta encode_delay = base::TimeDelta::Max();
   base::TimeDelta capture_pending_delay = base::TimeDelta::Max();
@@ skipping 26 matching lines @@
  public:
   virtual void OnVideoFrameStats(const FrameStats& stats) = 0;
  protected:
   virtual ~FrameStatsConsumer() {}
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_FRAME_STATS_H_