Reland of Add QP sum stats for received streams.

webrtc/video/video_stream_decoder.h

 /*
  *  Copyright (c) 2012 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 41 matching lines @@
       vcm::VideoReceiver* video_receiver,
       VCMFrameTypeCallback* vcm_frame_type_callback,
       VCMPacketRequestCallback* vcm_packet_request_callback,
       bool enable_nack,
       bool enable_fec,
       ReceiveStatisticsProxy* receive_statistics_proxy,
       rtc::VideoSinkInterface<VideoFrame>* incoming_video_stream);
   ~VideoStreamDecoder();
 
   // Implements VCMReceiveCallback.
-  int32_t FrameToRender(VideoFrame& video_frame) override;  // NOLINT
+  int32_t FrameToRender(VideoFrame& video_frame,
+                        rtc::Optional<uint8_t> qp) override;
   int32_t ReceivedDecodedReferenceFrame(const uint64_t picture_id) override;
   void OnIncomingPayloadType(int payload_type) override;
   void OnDecoderImplementationName(const char* implementation_name) override;
 
   // Implements VCMReceiveStatisticsCallback.
   void OnReceiveRatesUpdated(uint32_t bit_rate, uint32_t frame_rate) override;
   void OnDiscardedPacketsUpdated(int discarded_packets) override;
   void OnFrameCountsUpdated(const FrameCounts& frame_counts) override;
   void OnCompleteFrame(bool is_keyframe, size_t size_bytes) override;
   void OnFrameBufferTimingsUpdated(int decode_ms,
@@ skipping 27 matching lines @@
 
   ReceiveStatisticsProxy* const receive_stats_callback_;
   rtc::VideoSinkInterface<VideoFrame>* const incoming_video_stream_;
 
   int64_t last_rtt_ms_ GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIDEO_STREAM_DECODER_H_