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

media/base/pipeline.cc

 // Copyright (c) 2012 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 "media/base/pipeline.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 141 matching lines @@
     task_runner_->PostTask(FROM_HERE, base::Bind(
         &Pipeline::VolumeChangedTask, base::Unretained(this), volume));
   }
 }
 
 TimeDelta Pipeline::GetMediaTime() const {
   base::AutoLock auto_lock(lock_);
   return clock_->Elapsed();
 }
 
-Ranges<TimeDelta> Pipeline::GetBufferedTimeRanges() {
+Ranges<TimeDelta> Pipeline::GetBufferedTimeRanges() const {
   base::AutoLock auto_lock(lock_);
   return buffered_time_ranges_;
 }
 
 TimeDelta Pipeline::GetMediaDuration() const {
   base::AutoLock auto_lock(lock_);
   return clock_->Duration();
 }
 
 bool Pipeline::DidLoadingProgress() {
@@ skipping 791 matching lines @@
 void Pipeline::StartClockIfWaitingForTimeUpdate_Locked() {
   lock_.AssertAcquired();
   if (!waiting_for_clock_update_)
     return;
 
   waiting_for_clock_update_ = false;
   clock_->Play();
 }
 
 }  // namespace media