Added debug logging for MSE config changes.

media/filters/chunk_demuxer.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_FILTERS_CHUNK_DEMUXER_H_
 #define MEDIA_FILTERS_CHUNK_DEMUXER_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 156 matching lines @@
 
   // Returns the ranges representing the buffered data in the demuxer.
   Ranges<base::TimeDelta> GetBufferedRanges() const;
 
   mutable base::Lock lock_;
   State state_;
 
   DemuxerHost* host_;
   base::Closure open_cb_;
   NeedKeyCB need_key_cb_;
+  // Callback used to report error strings that can help the web developer
+  // figure out what is wrong with the content.
   LogCB log_cb_;
 
   PipelineStatusCB init_cb_;
   PipelineStatusCB seek_cb_;
 
   scoped_refptr<ChunkDemuxerStream> audio_;
   scoped_refptr<ChunkDemuxerStream> video_;
 
   base::TimeDelta duration_;
 
@@ skipping 13 matching lines @@
   // removed with RemoveID() but can not be re-added (yet).
   std::string source_id_audio_;
   std::string source_id_video_;
 
   DISALLOW_COPY_AND_ASSIGN(ChunkDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_CHUNK_DEMUXER_H_