Plumb media data from renderers up to MediaInternals in the browser process.

content/browser/renderer_host/media/media_observer.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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_OBSERVER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_OBSERVER_H_
 #pragma once
 
+#include "media/base/media_log.h"

[jam, 2011/07/29 16:08:55]

the C++ style guide advises against inner classes specifically for this reason,
i.e. they can't be forward declared.

MediaLog::Event should be in its own header and named MediaLogEvent

[Scott Franklin, 2011/07/29 22:30:25]

Done.

+
 // A class may implement MediaObserver and register itself with ResourceContext
 // to receive callbacks as media events occur.
 class MediaObserver {
  public:
   virtual ~MediaObserver() {}
 
   // Called when an audio stream is deleted.
   virtual void OnDeleteAudioStream(void* host, int stream_id) = 0;
 
   // Called when an audio stream is set to playing or paused.
   virtual void OnSetAudioStreamPlaying(void* host, int stream_id,
                                        bool playing) = 0;
 
   // Called when the status of an audio stream is set to "created", "flushed",
   // "closed", or "error".
   virtual void OnSetAudioStreamStatus(void* host, int stream_id,
                                       const std::string& status) = 0;
 
   // Called when the volume of an audio stream is set.
   virtual void OnSetAudioStreamVolume(void* host, int stream_id,
                                       double volume) = 0;
+
+  // Called when a MediaEvent occurs.
+  virtual void OnMediaEvent(const media::MediaLog::Event& event) = 0;
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_OBSERVER_H_