Implement timing frames.

webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc b/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
index debe836d8d70e853a36f8d32b9b59ad99ce9426f..500ef07807ae771126ed8214181433f8d21899f4 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
@@ -103,6 +103,14 @@ int32_t RTPReceiverVideo::ParseRtpPacket(WebRtcRTPHeader* rtp_header,
         rtp_header->header.extension.videoContentType;
   }
 
+  if (rtp_header->header.extension.hasVideoTiming) {
+    rtp_header->type.Video.video_timing =
+        rtp_header->header.extension.videoTiming;
+    rtp_header->type.Video.video_timing.is_timing_frame = true;
+  } else {
+    rtp_header->type.Video.video_timing.is_timing_frame = false;
+  }
+
   rtp_header->type.Video.playout_delay =
       rtp_header->header.extension.playout_delay;