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 42 matching lines @@
   media::Ranges<base::TimeDelta> ranges = demuxer_->GetBufferedRanges(id_);
   blink::WebTimeRanges result(ranges.size());
   for (size_t i = 0; i < ranges.size(); i++) {
     result[i].start = ranges.start(i).InSecondsF();
     result[i].end = ranges.end(i).InSecondsF();
   }
   return result;
 }
 
 void WebSourceBufferImpl::append(const unsigned char* data, unsigned length) {
-  demuxer_->AppendData(id_, data, length);
+  append(data, length, NULL);
+}
+
+void WebSourceBufferImpl::append(
+    const unsigned char* data,
+    unsigned length,
+    double* timestamp_offset) {
+  demuxer_->AppendData(id_, data, length, timestamp_offset);
 }
 
 void WebSourceBufferImpl::abort() {
   demuxer_->Abort(id_);
 }
 
 void WebSourceBufferImpl::remove(double start, double end) {
   demuxer_->Remove(id_, DoubleToTimeDelta(start), DoubleToTimeDelta(end));
 }
 
@@ skipping 10 matching lines @@
 void WebSourceBufferImpl::setAppendWindowEnd(double end) {
   demuxer_->SetAppendWindowEnd(id_, DoubleToTimeDelta(end));
 }
 
 void WebSourceBufferImpl::removedFromMediaSource() {
   demuxer_->RemoveId(id_);
   demuxer_ = NULL;
 }
 
 }  // namespace content