Add QP stats for received video streams to StatsReport.

talk/media/webrtc/webrtcvideoengine2.cc

Index: talk/media/webrtc/webrtcvideoengine2.cc
diff --git a/talk/media/webrtc/webrtcvideoengine2.cc b/talk/media/webrtc/webrtcvideoengine2.cc
index 7d1ddbadff11590e1c2b0cda96ee7d91cc0cb736..e805c19c44d3682b2895bb52cff51e6299b67ea7 100644
--- a/talk/media/webrtc/webrtcvideoengine2.cc
+++ b/talk/media/webrtc/webrtcvideoengine2.cc
@@ -2627,6 +2627,7 @@ WebRtcVideoChannel2::WebRtcVideoReceiveStream::GetVideoReceiverInfo() {
   info.min_playout_delay_ms = stats.min_playout_delay_ms;
   info.render_delay_ms = stats.render_delay_ms;
 
+  info.qp = stats.qp;
   info.codec_name = GetCodecNameFromPayloadType(stats.current_payload_type);
 
   info.firs_sent = stats.rtcp_packet_type_counts.fir_packets;