[Media Gallery] Add existing attached devices to the prefs in time for media galleries dialog.

chrome/browser/extensions/api/media_galleries/media_galleries_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.
 
 // Defines the Chrome Extensions Media Galleries API functions for accessing
 // user's media files, as specified in the extension API IDL.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_MEDIA_GALLERIES_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_MEDIA_GALLERIES_API_H_
 
 #include <vector>
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/media_gallery/media_file_system_registry.h"
 
 namespace extensions {
 
 class MediaGalleriesGetMediaFileSystemsFunction
     : public AsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("mediaGalleries.getMediaFileSystems")
 
  protected:
   virtual ~MediaGalleriesGetMediaFileSystemsFunction();
+
+  // ExtensionFunction:: override.
+  virtual bool HasPermission() OVERRIDE;
   virtual bool RunImpl() OVERRIDE;
 
  private:
   // If no galleries are found, show the dialog, otherwise return them.
   void ShowDialogIfNoGalleries(
       const std::vector<chrome::MediaFileSystemInfo>& filesystems);
 
   // Grabs galleries from the media file system registry and passes them to
   // |ReturnGalleries|.
   void GetAndReturnGalleries();
@@ skipping 12 matching lines @@
       "experimental.mediaGalleries.assembleMediaFile")
 
  protected:
   virtual ~MediaGalleriesAssembleMediaFileFunction();
   virtual bool RunImpl() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_MEDIA_GALLERIES_API_H_