Pass a TimeTicks along video capture pipeline to represent capture time

content/renderer/pepper/pepper_media_stream_video_track_host.cc

Index: content/renderer/pepper/pepper_media_stream_video_track_host.cc
diff --git a/content/renderer/pepper/pepper_media_stream_video_track_host.cc b/content/renderer/pepper/pepper_media_stream_video_track_host.cc
index e12ed4012043d92c4b4493804ba64eae7803e869..4b0caab4e293ad3c08120d0896454a05e9a618c7 100644
--- a/content/renderer/pepper/pepper_media_stream_video_track_host.cc
+++ b/content/renderer/pepper/pepper_media_stream_video_track_host.cc
@@ -225,7 +225,9 @@ void PepperMediaStreamVideoTrackHost::FrameDeliverer::DeliverFrameOnIO(
      const scoped_refptr<media::VideoFrame>& frame,
      const media::VideoCaptureFormat& format) {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
-  new_frame_callback_.Run(frame, format);
+  // The time when this stream starts is unknown so give a null value to
+  // |start_ticks|.
+  new_frame_callback_.Run(frame, format, base::TimeTicks());
 }
 
 PepperMediaStreamVideoTrackHost::PepperMediaStreamVideoTrackHost(
@@ -381,7 +383,8 @@ int32_t PepperMediaStreamVideoTrackHost::SendFrameToTrack(int32_t index) {
 
 void PepperMediaStreamVideoTrackHost::OnVideoFrame(
     const scoped_refptr<VideoFrame>& frame,
-    const media::VideoCaptureFormat& format) {
+    const media::VideoCaptureFormat& format,
+    const base::TimeTicks& start_ticks) {
   DCHECK(frame);
   // TODO(penghuang): Check |frame->end_of_stream()| and close the track.
   PP_VideoFrame_Format ppformat = ToPpapiFormat(frame->format());