Reland of Add QP sum stats for received streams.

webrtc/video_receive_stream.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 52 matching lines @@
     std::string decoder_implementation_name = "unknown";
     FrameCounts frame_counts;
     int decode_ms = 0;
     int max_decode_ms = 0;
     int current_delay_ms = 0;
     int target_delay_ms = 0;
     int jitter_buffer_ms = 0;
     int min_playout_delay_ms = 0;
     int render_delay_ms = 10;
     uint32_t frames_decoded = 0;
+    rtc::Optional<uint64_t> qp_sum;
 
     int current_payload_type = -1;
 
     int total_bitrate_bps = 0;
     int discarded_packets = 0;
 
     int width = 0;
     int height = 0;
 
     int sync_offset_ms = std::numeric_limits<int>::max();
@@ skipping 122 matching lines @@
     EnableEncodedFrameRecording(rtc::kInvalidPlatformFileValue, 0);
   }
 
  protected:
   virtual ~VideoReceiveStream() {}
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_RECEIVE_STREAM_H_