media-internals: Store updates when cannot update.

content/browser/media/media_internals.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 CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
 #define CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 32 matching lines @@
 
   // Add/remove update callbacks (see above). Must be called on the UI thread.
   // The callbacks must also be fired on UI thread.
   void AddUpdateCallback(const UpdateCallback& callback);
   void RemoveUpdateCallback(const UpdateCallback& callback);
 
   // Whether there are any update callbacks available. Can be called on any
   // thread.
   bool CanUpdate();
 
+  // Replay all saved media events.
+  void SendHistoricalMediaEvents();
+
   // Sends all audio cached data to each registered UpdateCallback.
   void SendAudioStreamData();
 
   // Sends all video capture capabilities cached data to each registered
   // UpdateCallback.
   void SendVideoCaptureDeviceCapabilities();
 
   // Called to inform of the capabilities enumerated for video devices.
   void UpdateVideoCaptureDeviceCapabilities(
       const media::VideoCaptureDeviceInfos& video_capture_device_infos);
@@ skipping 16 matching lines @@
   friend class AudioLogImpl;
   friend class MediaInternalsTest;
   friend struct base::DefaultLazyInstanceTraits<MediaInternals>;
 
   MediaInternals();
 
   // Sends |update| to each registered UpdateCallback.  Safe to call from any
   // thread, but will forward to the IO thread.
   void SendUpdate(const base::string16& update);
 
+  // Saves |update| so that they can be sent when there are UpdateCallback
+  // registered.
+  void SaveUpdate(const base::string16& update);
+
   // Caches |value| under |cache_key| so that future SendAudioLogUpdate() calls
   // will include the current data.  Calls JavaScript |function|(|value|) for
   // each registered UpdateCallback.
   enum AudioLogUpdateType {
     CREATE,             // Creates a new AudioLog cache entry.
     UPDATE_IF_EXISTS,   // Updates an existing AudioLog cache entry, does
                         // nothing if it doesn't exist.
     UPDATE_AND_DELETE,  // Deletes an existing AudioLog cache entry.
   };
   void SendAudioLogUpdate(AudioLogUpdateType type,
                           const std::string& cache_key,
                           const std::string& function,
                           const base::DictionaryValue* value);
 
   // Must only be accessed on the UI thread.
   std::vector<UpdateCallback> update_callbacks_;
 
   // Must only be accessed on the IO thread.
   base::ListValue video_capture_capabilities_cached_data_;
 
   // All variables below must be accessed under |lock_|.
   base::Lock lock_;
   bool can_update_;
+  std::list<base::string16> pending_updates_;
   base::DictionaryValue audio_streams_cached_data_;
   int owner_ids_[AUDIO_COMPONENT_MAX];
   scoped_ptr<MediaInternalsUMAHandler> uma_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaInternals);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_