[Media Galleries] Lazily initialize the storage monitor.

chrome/browser/extensions/api/media_galleries_private/gallery_watch_state_tracker.h

Index: chrome/browser/extensions/api/media_galleries_private/gallery_watch_state_tracker.h
diff --git a/chrome/browser/extensions/api/media_galleries_private/gallery_watch_state_tracker.h b/chrome/browser/extensions/api/media_galleries_private/gallery_watch_state_tracker.h
index 559497abfb7a2ff409dd2aee3dcb8061b3b8872e..1ca510d37aba4423eeec5de2d92ae397c4c2b8df 100644
--- a/chrome/browser/extensions/api/media_galleries_private/gallery_watch_state_tracker.h
+++ b/chrome/browser/extensions/api/media_galleries_private/gallery_watch_state_tracker.h
@@ -53,9 +53,11 @@ class GalleryWatchStateTracker
   // |has_permission| is set to true if the user granted permission to
   // access the gallery associated with the |gallery_id| and is set to false
   // if the user revoked the gallery permission.
-  void OnGalleryPermissionChanged(const std::string& extension_id,
-                                  chrome::MediaGalleryPrefId gallery_id,
-                                  bool has_permission);
+  void OnGalleryPermissionChanged(
+      const std::string& extension_id,
+      chrome::MediaGalleryPrefId gallery_id,
+      bool has_permission,
+      chrome::MediaGalleriesPreferences* preferences);
 
   // Returns a set of watched gallery identifiers for the extension specified
   // by the |extension_id|.
@@ -64,7 +66,9 @@ class GalleryWatchStateTracker
 
   // Removes all the gallery watchers associated with the extension specified
   // by the |extension_id|.
-  void RemoveAllGalleryWatchersForExtension(const std::string& extension_id);
+  void RemoveAllGalleryWatchersForExtension(
+      const std::string& extension_id,
+      chrome::MediaGalleriesPreferences* preferences);
 
  private:
   // Key: Gallery identifier.
@@ -77,6 +81,10 @@ class GalleryWatchStateTracker
   // Value: Map of watched gallery information.
   typedef std::map<std::string, WatchedGalleriesMap> WatchedExtensionsMap;
 
+  // Bottom half of constructor. Called once the storage monitor is initialized,
+  // and sets up notification observer.
+  void OnStorageMonitorInitialized();
+
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
@@ -91,12 +99,14 @@ class GalleryWatchStateTracker
   // Sets up the gallery watcher on the receipt of granted gallery permission
   // event.
   void SetupGalleryWatch(const std::string& extension_id,
-                         chrome::MediaGalleryPrefId gallery_id);
+                         chrome::MediaGalleryPrefId gallery_id,
+                         chrome::MediaGalleriesPreferences* preferences);
 
   // Removes the gallery watcher on the receipt of revoked gallery permission
   // event.
   void RemoveGalleryWatch(const std::string& extension_id,
-                          chrome::MediaGalleryPrefId gallery_id);
+                          chrome::MediaGalleryPrefId gallery_id,
+                          chrome::MediaGalleriesPreferences* preferences);
 
   // Returns true if a gallery watcher exists for the extension.
   // Set |has_active_watcher| to true to find if the gallery watcher is active.