Implement mediaGalleriesPrivate api to notify extensions about gallery changed events.

chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.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 CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_PRIVATE_MEDIA_GALLERIES_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_PRIVATE_MEDIA_GALLERIES_PRIVATE_API_H_
 
+#include <string>
+
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/event_router.h"
+#include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/media_gallery/media_galleries_preferences.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 
+class FilePath;
+class Profile;
+
 namespace extensions {
+
+class MediaGalleryExtensionNotificationObserver;
 class MediaGalleriesPrivateEventRouter;
 
+// The profile-keyed service that manages the media galleries private extension
+// API.
 class MediaGalleriesPrivateAPI : public ProfileKeyedService,
-                                 public extensions::EventRouter::Observer {
+                                 public EventRouter::Observer {
  public:
   explicit MediaGalleriesPrivateAPI(Profile* profile);
   virtual ~MediaGalleriesPrivateAPI();
 
   // ProfileKeyedService implementation.
   virtual void Shutdown() OVERRIDE;
 
   // EventRouter::Observer implementation.
-  virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
-      OVERRIDE;
+  virtual void OnListenerAdded(const EventListenerInfo& details) OVERRIDE;
+
+  MediaGalleriesPrivateEventRouter* GetEventRouter();
 
  private:
+  void MaybeInitializeEventRouter();
+
+  // Current profile.
   Profile* profile_;
 
+  scoped_ptr<MediaGalleryExtensionNotificationObserver>
+      extension_notification_observer_;
+
+  // Created lazily on first access.
   scoped_ptr<MediaGalleriesPrivateEventRouter>
       media_galleries_private_event_router_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaGalleriesPrivateAPI);
+};
+
+// Implements the chrome.mediaGalleriesPrivate.addGalleryWatch method.
+class MediaGalleriesPrivateAddGalleryWatchFunction
+    : public AsyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION_NAME("mediaGalleriesPrivate.addGalleryWatch");
+
+ protected:
+  virtual ~MediaGalleriesPrivateAddGalleryWatchFunction();
+
+  // AsyncExtensionFunction overrides.
+  virtual bool RunImpl() OVERRIDE;
+
+ private:
+  // Gallery watch request handler.
+  void HandleResponse(chrome::MediaGalleryPrefId gallery_id,
+                      bool success);
+};
+
+// Implements the chrome.mediaGalleriesPrivate.removeGalleryWatch method.
+class MediaGalleriesPrivateRemoveGalleryWatchFunction
+    : public SyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION_NAME("mediaGalleriesPrivate.removeGalleryWatch");
+
+ protected:
+  virtual ~MediaGalleriesPrivateRemoveGalleryWatchFunction();
+
+  // SyncExtensionFunction overrides.
+  virtual bool RunImpl() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_PRIVATE_MEDIA_GALLERIES_PRIVATE_API_H_