Report timing frames info in GetStats.

webrtc/pc/statscollector.cc

Index: webrtc/pc/statscollector.cc
diff --git a/webrtc/pc/statscollector.cc b/webrtc/pc/statscollector.cc
index c9325831598549b50c3d1e63de24cddd54ab8ab3..27cb6c30833fc1a900270bf98c06f0357ec872e5 100644
--- a/webrtc/pc/statscollector.cc
+++ b/webrtc/pc/statscollector.cc
@@ -249,6 +249,10 @@ void ExtractStats(const cricket::VideoReceiverInfo& info, StatsReport* report) {
   for (const auto& i : ints)
     report->AddInt(i.name, i.value);
   report->AddString(StatsReport::kStatsValueNameMediaType, "video");
+  if (info.timing_frame_info) {
+    report->AddString(StatsReport::kStatsValueNameTimingFrameInfo,
+                      info.timing_frame_info->ToString());
+  }
 }
 
 void ExtractStats(const cricket::VideoSenderInfo& info, StatsReport* report) {