Enable round-tripping and updating of WebSourceBufferImpl timestamp offset

content/renderer/media/websourcebuffer_impl.cc

 // Copyright 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/websourcebuffer_impl.h"
 
 #include "base/float_util.h"
 #include "media/filters/chunk_demuxer.h"
 
 namespace content {
@@ skipping 54 matching lines @@
 
 void WebSourceBufferImpl::abort() {
   demuxer_->Abort(id_);
 }
 
 void WebSourceBufferImpl::remove(double start, double end) {
   demuxer_->Remove(id_, DoubleToTimeDelta(start), DoubleToTimeDelta(end));
 }
 
 bool WebSourceBufferImpl::setTimestampOffset(double offset) {
-  base::TimeDelta time_offset = base::TimeDelta::FromMicroseconds(
-      offset * base::Time::kMicrosecondsPerSecond);
-  return demuxer_->SetTimestampOffset(id_, time_offset);
+  return demuxer_->SetTimestampOffset(id_, offset);
+}
+
+double WebSourceBufferImpl::getTimestampOffset() {
+  return demuxer_->GetTimestampOffset(id_);
 }
 
 void WebSourceBufferImpl::setAppendWindowStart(double start) {
   demuxer_->SetAppendWindowStart(id_, DoubleToTimeDelta(start));
 }
 
 void WebSourceBufferImpl::setAppendWindowEnd(double end) {
   demuxer_->SetAppendWindowEnd(id_, DoubleToTimeDelta(end));
 }
 
 void WebSourceBufferImpl::removedFromMediaSource() {
   demuxer_->RemoveId(id_);
   demuxer_ = NULL;
 }
 
 }  // namespace content