Report timing frames info in GetStats.

webrtc/video/receive_statistics_proxy.h

Index: webrtc/video/receive_statistics_proxy.h
diff --git a/webrtc/video/receive_statistics_proxy.h b/webrtc/video/receive_statistics_proxy.h
index e1d097152e8d9bcd277d0226b8adc1d4bab7b717..3e823414493c004ec2d8ecbaea61396e936d9c0b 100644
--- a/webrtc/video/receive_statistics_proxy.h
+++ b/webrtc/video/receive_statistics_proxy.h
@@ -69,6 +69,8 @@ class ReceiveStatisticsProxy : public VCMReceiveStatisticsCallback,
                                    int min_playout_delay_ms,
                                    int render_delay_ms) override;
 
+  void OnTimingFrameInfoUpdated(const TimingFrameInfo& info) override;
+
   // Overrides RtcpStatisticsCallback.
   void StatisticsUpdated(const webrtc::RtcpStatistics& statistics,
                          uint32_t ssrc) override;
@@ -152,6 +154,7 @@ class ReceiveStatisticsProxy : public VCMReceiveStatisticsCallback,
   int64_t avg_rtt_ms_ GUARDED_BY(crit_);
   mutable std::map<int64_t, size_t> frame_window_ GUARDED_BY(&crit_);
   VideoContentType last_content_type_ GUARDED_BY(&crit_);
+  mutable rtc::Optional<TimingFrameInfo> timing_frame_info_ GUARDED_BY(&crit_);
 };
 
 }  // namespace webrtc