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

media/blink/buffered_data_source.h

 // 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.
 
 #ifndef MEDIA_BLINK_BUFFERED_DATA_SOURCE_H_
 #define MEDIA_BLINK_BUFFERED_DATA_SOURCE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 95 matching lines @@
   bool media_has_played() const { return media_has_played_; }
 
   // Returns true if the resource is local.
   bool assume_fully_buffered() { return !url_.SchemeIsHTTPOrHTTPS(); }
 
   // Cancels any open network connections once reaching the deferred state for
   // preload=metadata, non-streaming resources that have not started playback.
   // If already deferred, connections will be immediately closed.
   void OnBufferingHaveEnough();
 
+  // Returns an estimate of the number of bytes held by the data source.
+  int64_t GetMemoryUsage() const;
+
   // DataSource implementation.
   // Called from demuxer thread.
   void Stop() override;
 
   void Read(int64 position,
             int size,
             uint8* data,
             const DataSource::ReadCB& read_cb) override;
   bool GetSize(int64* size_out) override;
   bool IsStreaming() override;
@@ skipping 127 matching lines @@
   // reaching into this class from multiple threads to attain a WeakPtr.
   base::WeakPtr<BufferedDataSource> weak_ptr_;
   base::WeakPtrFactory<BufferedDataSource> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferedDataSource);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_BUFFERED_DATA_SOURCE_H_