Add return-by-value implementations of blink::WebMediaPlayer::buffered()

content/renderer/media/buffered_data_source_host_impl.cc

 // Copyright 2014 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/buffered_data_source_host_impl.h"
 
 namespace content {
 
 BufferedDataSourceHostImpl::BufferedDataSourceHostImpl()
     : total_bytes_(0),
@@ skipping 17 matching lines @@
   if (position < 0.01)
     return base::TimeDelta();
   if (position > 0.99)
     return duration;
   return base::TimeDelta::FromMilliseconds(
       static_cast<int64>(position * duration.InMilliseconds()));
 }
 
 void BufferedDataSourceHostImpl::AddBufferedTimeRanges(
     media::Ranges<base::TimeDelta>* buffered_time_ranges,
-    base::TimeDelta media_duration) {
+    base::TimeDelta media_duration) const {
   if (total_bytes_ && buffered_byte_ranges_.size()) {
     for (size_t i = 0; i < buffered_byte_ranges_.size(); ++i) {
       int64 start = buffered_byte_ranges_.start(i);
       int64 end = buffered_byte_ranges_.end(i);
       buffered_time_ranges->Add(
           TimeForByteOffset(start, total_bytes_, media_duration),
           TimeForByteOffset(end, total_bytes_, media_duration));
     }
   }
 }
 
 bool BufferedDataSourceHostImpl::DidLoadingProgress() {
   bool ret = did_loading_progress_;
   did_loading_progress_ = false;
   return ret;
 }
 
 }  // namespace content