Add encode and decode time to histograms stats:

webrtc/video/send_statistics_proxy.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 31 matching lines @@
   SendStatisticsProxy(Clock* clock, const VideoSendStream::Config& config);
   virtual ~SendStatisticsProxy();
 
   VideoSendStream::Stats GetStats();
 
   virtual void OnSendEncodedImage(const EncodedImage& encoded_image,
                                   const RTPVideoHeader* rtp_video_header);
   // Used to update incoming frame rate.
   void OnIncomingFrame(int width, int height);
 
+  // Used to update encode time of frames.
+  void OnEncodedFrame(int encode_time_ms);
+
   // From VideoEncoderRateObserver.
   void OnSetRates(uint32_t bitrate_bps, int framerate) override;
 
   void OnInactiveSsrc(uint32_t ssrc);
 
  protected:
   // From CpuOveruseMetricsObserver.
   void CpuOveruseMetricsUpdated(const CpuOveruseMetrics& metrics) override;
   // From RtcpStatisticsCallback.
   void StatisticsUpdated(const RtcpStatistics& statistics,
@@ skipping 56 matching lines @@
   rtc::RateTracker sent_frame_rate_tracker_total_ GUARDED_BY(crit_);
   uint32_t last_sent_frame_timestamp_ GUARDED_BY(crit_);
   std::map<uint32_t, StatsUpdateTimes> update_times_ GUARDED_BY(crit_);
 
   int max_sent_width_per_timestamp_ GUARDED_BY(crit_);
   int max_sent_height_per_timestamp_ GUARDED_BY(crit_);
   SampleCounter input_width_counter_ GUARDED_BY(crit_);
   SampleCounter input_height_counter_ GUARDED_BY(crit_);
   SampleCounter sent_width_counter_ GUARDED_BY(crit_);
   SampleCounter sent_height_counter_ GUARDED_BY(crit_);
+  SampleCounter encode_time_counter_ GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_SEND_STATISTICS_PROXY_H_