Add methods for telling V8 how much memory audio/video is using.

media/base/decoder_buffer_queue.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/decoder_buffer_queue.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/timestamp_constants.h"
@@ skipping 57 matching lines @@
   return buffer;
 }
 
 void DecoderBufferQueue::Clear() {
   queue_.clear();
   data_size_ = 0;
   in_order_queue_.clear();
   earliest_valid_timestamp_ = kNoTimestamp();
 }
 
-bool DecoderBufferQueue::IsEmpty() {
+bool DecoderBufferQueue::IsEmpty() const {
   return queue_.empty();
 }
 
 base::TimeDelta DecoderBufferQueue::Duration() {
   if (in_order_queue_.size() < 2)
     return base::TimeDelta();
 
   base::TimeDelta start = in_order_queue_.front()->timestamp();
   base::TimeDelta end = in_order_queue_.back()->timestamp();
   return end - start;
 }
 
 }  // namespace media