Add QP stats for received video streams to StatsReport.

webrtc/video/receive_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.
  */
 
 #ifndef WEBRTC_VIDEO_RECEIVE_STATISTICS_PROXY_H_
 #define WEBRTC_VIDEO_RECEIVE_STATISTICS_PROXY_H_
 
 #include <string>
 
 #include "webrtc/base/criticalsection.h"
+#include "webrtc/base/exp_filter.h"
 #include "webrtc/base/ratetracker.h"
 #include "webrtc/base/thread_annotations.h"
 #include "webrtc/common_types.h"
 #include "webrtc/frame_callback.h"
 #include "webrtc/modules/remote_bitrate_estimator/rate_statistics.h"
 #include "webrtc/modules/video_coding/main/interface/video_coding_defines.h"
 #include "webrtc/video_engine/report_block_stats.h"
 #include "webrtc/video_engine/vie_channel.h"
 #include "webrtc/video_receive_stream.h"
 #include "webrtc/video_renderer.h"
@@ skipping 72 matching lines @@
   RateStatistics decode_fps_estimator_ GUARDED_BY(crit_);
   RateStatistics renders_fps_estimator_ GUARDED_BY(crit_);
   rtc::RateTracker render_fps_tracker_ GUARDED_BY(crit_);
   rtc::RateTracker render_pixel_tracker_ GUARDED_BY(crit_);
   SampleCounter render_width_counter_ GUARDED_BY(crit_);
   SampleCounter render_height_counter_ GUARDED_BY(crit_);
   SampleCounter decode_time_counter_ GUARDED_BY(crit_);
   SampleCounter delay_counter_ GUARDED_BY(crit_);
   ReportBlockStats report_block_stats_ GUARDED_BY(crit_);
   QpCounters qp_counters_;  // Only accessed on the decoding thread.
+  rtc::ExpFilter qp_;       // Only accessed on the decoding thread.
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_RECEIVE_STATISTICS_PROXY_H_