Abstract media galleries context menu code and use it in scan result dialog.

chrome/browser/media_galleries/media_galleries_dialog_controller.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_MEDIA_GALLERIES_MEDIA_GALLERIES_DIALOG_CONTROLLER_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_GALLERIES_DIALOG_CONTROLLER_H_
 
 #include <list>
 #include <map>
 
@@ skipping 10 matching lines @@
 }
 
 namespace extensions {
 class Extension;
 }
 
 namespace ui {
 class MenuModel;
 }
 
-class GalleryContextMenuModel;
 class MediaGalleriesDialogController;
+class MediaGalleryContextMenu;
 class Profile;
 
 // The view.
 class MediaGalleriesDialog {
  public:
   virtual ~MediaGalleriesDialog();
 
   // Tell the dialog to update its display list of galleries.
   virtual void UpdateGalleries() = 0;
 
@@ skipping 48 matching lines @@
   virtual void OnAddFolderClicked();
 
   // A checkbox beside a gallery permission was checked. The full set
   // of gallery permissions checkbox settings is sent on every checkbox toggle.
   virtual void DidToggleGalleryId(MediaGalleryPrefId pref_id,
                                   bool enabled);
   virtual void DidToggleNewGallery(const MediaGalleryPrefInfo& gallery,
                                    bool enabled);
 
   // The forget command in the context menu was selected.
   virtual void DidForgetGallery(MediaGalleryPrefId pref_id);

[groby-ooo-7-16, 2014/01/29 05:01:37]

Out of scope for this CL, but: A base class with non-abstract virtuals? 

[vandebo (ex-Chrome), 2014/01/29 17:16:55]

Presumably that's to support the controller mock:
chrome/browser/media_galleries/media_galleries_dialog_controller_mock.h

 
   // The dialog is being deleted.
   virtual void DialogFinished(bool accepted);
 
   virtual content::WebContents* web_contents();
 
-  ui::MenuModel* GetContextMenuModel(MediaGalleryPrefId id);
+  ui::MenuModel* GetContextMenu(MediaGalleryPrefId id);
 
  protected:
   // For use with tests.
   explicit MediaGalleriesDialogController(
       const extensions::Extension& extension);
 
   virtual ~MediaGalleriesDialogController();
 
  private:
   // This type keeps track of media galleries already known to the prefs system.
@@ skipping 74 matching lines @@
 
   // The model that tracks galleries and extensions' permissions.
   // This is the authoritative source for gallery information.
   MediaGalleriesPreferences* preferences_;
 
   // The view that's showing.
   scoped_ptr<MediaGalleriesDialog> dialog_;
 
   scoped_refptr<ui::SelectFileDialog> select_folder_dialog_;
 
-  scoped_ptr<ui::MenuModel> context_menu_model_;
-  scoped_ptr<GalleryContextMenuModel> gallery_menu_model_;
+  scoped_ptr<MediaGalleryContextMenu> context_menu_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaGalleriesDialogController);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_GALLERIES_DIALOG_CONTROLLER_H_