Refactor MediaResource to be multi-stream capable

media/base/demuxer_stream.h

 // 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.
 
 #ifndef MEDIA_BASE_DEMUXER_STREAM_H_
 #define MEDIA_BASE_DEMUXER_STREAM_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
@@ skipping 86 matching lines @@
   // Indicates whether a DemuxerStream is currently enabled (i.e. should be
   // decoded and rendered) or not.
   virtual bool enabled() const = 0;
 
   // Disables and re-enables the stream. Reading from a disabled stream will
   // return an end-of-stream (EOS) buffer. When a stream is re-enabled, it needs
   // to know the current playback position |timestamp| in order to resume
   // reading data from a key frame preceeding the |timestamp|.
   virtual void set_enabled(bool enabled, base::TimeDelta timestamp) = 0;
 
-  // The StreamStatusChangeCB allows DemuxerStream clients to receive
-  // notifications about the stream being disabled or enabled.
-  // The first parameter indicates whether the stream is enabled or disabled.
-  // The second parameter is the playback position when the change occured.
-  using StreamStatusChangeCB = base::Callback<void(bool, base::TimeDelta)>;
-  virtual void SetStreamStatusChangeCB(const StreamStatusChangeCB& cb) = 0;
-
  protected:
   // Only allow concrete implementations to get deleted.
   virtual ~DemuxerStream();
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DEMUXER_STREAM_H_