Log BufferedResourceLoader events to MediaLog.

media/base/media_log_event.h

 // Copyright (c) 2011 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_MEDIA_LOG_EVENT_H_
 #define MEDIA_BASE_MEDIA_LOG_EVENT_H_
 #pragma once
 
 #include "base/time.h"
 #include "base/values.h"
 
 namespace media {
 
 struct MediaLogEvent {
   enum Type {
     // A media player is being created or destroyed.
     // params: none.
     CREATING,
     DESTROYING,
 
     // A media player is loading a resource.
     // params: "url": <URL of the resource>.
     LOAD,
 
     // A media player has been told to play or pause.
     // params: none.
     PLAY,
     PAUSE,
+
+    // The extents of the sliding buffer have changed.
+    // params: "buffer_start": <first buffered byte>.
+    //         "buffer_current": <current offset>.
+    //         "buffer_end": <last buffered byte>.
+    BUFFERED_EXTENTS_CHANGED,
   };
 
   int32 id;
   Type type;
   base::DictionaryValue params;
   base::Time time;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_LOG_EVENT_H_