Pass a TimeTicks along video capture pipeline to represent capture time

content/renderer/media/webrtc/video_destination_handler.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webrtc/video_destination_handler.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/logging.h"
@@ skipping 49 matching lines @@
   io_message_loop_->PostTask(
       FROM_HERE,
       base::Bind(&FrameWriterDelegate::DeliverFrameOnIO,
                  this, frame, format));
 }
 
 void PpFrameWriter::FrameWriterDelegate::DeliverFrameOnIO(
      const scoped_refptr<media::VideoFrame>& frame,
      const media::VideoCaptureFormat& format) {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
-  new_frame_callback_.Run(frame, format);
+  // The local time when this frame is generated is unknown so give a null
+  // value to |estimated_capture_time|.
+  new_frame_callback_.Run(frame, format, base::TimeTicks());
 }
 
 PpFrameWriter::PpFrameWriter() {
   DVLOG(3) << "PpFrameWriter ctor";
 }
 
 PpFrameWriter::~PpFrameWriter() {
   DVLOG(3) << "PpFrameWriter dtor";
 }
 
@@ skipping 143 matching lines @@
 
   stream.addTrack(MediaStreamVideoTrack::CreateVideoTrack(
       writer, constraints, MediaStreamVideoSource::ConstraintsCallback(),
       track_enabled));
 
   *frame_writer = new PpFrameWriterProxy(writer->AsWeakPtr());
   return true;
 }
 
 }  // namespace content