Add QP stats for received video streams to StatsReport.

talk/app/webrtc/statscollector.cc

Index: talk/app/webrtc/statscollector.cc
diff --git a/talk/app/webrtc/statscollector.cc b/talk/app/webrtc/statscollector.cc
index 347a84640cf9973a72d86e5133d5b4bc038dbb72..a445ec4bb923cd45ec38db2a48969a5733d78dae 100644
--- a/talk/app/webrtc/statscollector.cc
+++ b/talk/app/webrtc/statscollector.cc
@@ -219,6 +219,7 @@ void ExtractStats(const cricket::VideoReceiverInfo& info, StatsReport* report) {
     { StatsReport::kStatsValueNamePacketsLost, info.packets_lost },
     { StatsReport::kStatsValueNamePacketsReceived, info.packets_rcvd },
     { StatsReport::kStatsValueNamePlisSent, info.plis_sent },
+    { StatsReport::kStatsValueNameQpReceived, info.qp },
     { StatsReport::kStatsValueNameRenderDelayMs, info.render_delay_ms },
     { StatsReport::kStatsValueNameTargetDelayMs, info.target_delay_ms },
   };