Add histogram stats for AV sync stream offset:

webrtc/video/video_receive_stream.cc

 /*
  *  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 370 matching lines @@
                                     const VideoFrame& video_frame) {
   // TODO(pbos): Wire up config_.render->IsTextureSupported() and convert if not
   // supported. Or provide methods for converting a texture frame in
   // VideoFrame.
 
   if (config_.renderer != nullptr)
     config_.renderer->RenderFrame(
         video_frame,
         video_frame.render_time_ms() - clock_->TimeInMilliseconds());
 
-  stats_proxy_.OnRenderedFrame(video_frame.width(), video_frame.height());
+  stats_proxy_.OnRenderedFrame(video_frame.width(), video_frame.height(),
+                               vie_sync_.GetStreamSyncOffsetInMs(video_frame));
 
   return 0;
 }
 
 // TODO(asapersson): Consider moving callback from video_encoder.h or
 // creating a different callback.
 int32_t VideoReceiveStream::Encoded(
     const EncodedImage& encoded_image,
     const CodecSpecificInfo* codec_specific_info,
     const RTPFragmentationHeader* fragmentation) {
@@ skipping 16 matching lines @@
   return true;
 }
 
 void VideoReceiveStream::Decode() {
   static const int kMaxDecodeWaitTimeMs = 50;
   vcm_->Decode(kMaxDecodeWaitTimeMs);
 }
 
 }  // namespace internal
 }  // namespace webrtc