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

media/blink/buffered_data_source.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 "media/blink/buffered_data_source.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 219 matching lines @@
                                     weak_factory_.GetWeakPtr(),
                                     bitrate));
 }
 
 void BufferedDataSource::OnBufferingHaveEnough() {
   DCHECK(render_task_runner_->BelongsToCurrentThread());
   if (loader_ && preload_ == METADATA && !media_has_played_ && !IsStreaming())
     loader_->CancelUponDeferral();
 }
 
+int64_t BufferedDataSource::GetMemoryUsage() const {
+  DCHECK(render_task_runner_->BelongsToCurrentThread());
+  return loader_ ? loader_->GetMemoryUsage() : 0;
+}
+
 void BufferedDataSource::Read(
     int64 position, int size, uint8* data,
     const DataSource::ReadCB& read_cb) {
   DVLOG(1) << "Read: " << position << " offset, " << size << " bytes";
   DCHECK(!read_cb.is_null());
 
   {
     base::AutoLock auto_lock(lock_);
     DCHECK(!read_op_);
 
@@ skipping 321 matching lines @@
   }
 
   // If media is currently playing or the page indicated preload=auto or the
   // the server does not support the byte range request or we do not want to go
   // too far ahead of the read head, use threshold strategy to enable/disable
   // deferring when the buffer is full/depleted.
   loader_->UpdateDeferStrategy(BufferedResourceLoader::kCapacityDefer);
 }
 
 }  // namespace media