[Media Galleries] Lazily initialize the storage monitor.

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_galleries/media_file_system_registry.h"
+#include "chrome/common/extensions/api/media_galleries.h"
+
+namespace MediaGalleries = extensions::api::media_galleries;
 
 namespace extensions {
 
 class MediaGalleriesGetMediaFileSystemsFunction
     : public AsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("mediaGalleries.getMediaFileSystems",
                              MEDIAGALLERIES_GETMEDIAFILESYSTEMS)
 
  protected:
   virtual ~MediaGalleriesGetMediaFileSystemsFunction();
   virtual bool RunImpl() OVERRIDE;
 
  private:
+  // Bottom half for RunImpl, invoked after the storage monitor is initialized.

[vandebo (ex-Chrome), 2013/05/31 18:05:03]

nit: Since RunImpl was already async and posts tasks with callbacks, to call
this the bottom half is not quite right.  Not sure what the right comment is
though.

[Greg Billock, 2013/06/01 01:48:46]

Hmm. I don't think of bottom half being that specific.  And besides, RunImpl is
getting called synchronously.

+  void OnStorageMonitorInit(
+    MediaGalleries::GetMediaFileSystemsInteractivity interactive);
+
   // Always show the dialog.
   void AlwaysShowDialog(
       const std::vector<chrome::MediaFileSystemInfo>& filesystems);
 
   // 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|.
@@ skipping 19 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_