Add QP sum stats for received streams.

webrtc/video/video_receive_stream.cc

Index: webrtc/video/video_receive_stream.cc
diff --git a/webrtc/video/video_receive_stream.cc b/webrtc/video/video_receive_stream.cc
index 3d9fa07b6ee23c47143d2b8f9c9f4f454f98e3b8..36a1a8b290f40a2ecc9324b6a57dd76c2a657216 100644
--- a/webrtc/video/video_receive_stream.cc
+++ b/webrtc/video/video_receive_stream.cc
@@ -369,10 +369,6 @@ void VideoReceiveStream::EnableEncodedFrameRecording(rtc::PlatformFile file,
 
 // TODO(tommi): This method grabs a lock 6 times.
 void VideoReceiveStream::OnFrame(const VideoFrame& video_frame) {
-  // TODO(tommi): OnDecodedFrame grabs a lock, incidentally the same lock
-  // that OnSyncOffsetUpdated() and OnRenderedFrame() below grab.
-  stats_proxy_.OnDecodedFrame();
-
   int64_t sync_offset_ms;
   double estimated_freq_khz;
   // TODO(tommi): GetStreamSyncOffsetInMs grabs three locks.  One inside the