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/base/buffers.h"
 #include "media/filters/chunk_demuxer.h"
 
 namespace content {
 
 static base::TimeDelta DoubleToTimeDelta(double time) {
   DCHECK(!base::IsNaN(time));
   DCHECK_GE(time, 0);
   if (time == std::numeric_limits<double>::infinity())
     return media::kInfiniteDuration();
 
@@ skipping 52 matching lines @@
 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);
 }
 
+double WebSourceBufferImpl::updatedTimestampOffset() {
+  base::TimeDelta updated_offset = demuxer_->GetUpdatedTimestampOffset(id_);
+
+  if (updated_offset == media::kNoTimestamp())
+    return std::numeric_limits<double>::quiet_NaN();
+
+  return updated_offset.InSecondsF();
+}
+
 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