Disable folder UI when app sync is disabled

ui/app_list/app_list_model.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 UI_APP_LIST_APP_LIST_MODEL_H_
 #define UI_APP_LIST_APP_LIST_MODEL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 94 matching lines @@
                                const std::string& name,
                                const std::string& short_name);
 
   // Deletes the item matching |id| from |top_level_item_list_| or from the
   // appropriate folder.
   void DeleteItem(const std::string& id);
 
   // Call OnExtensionPreferenceChanged() for all items in the model.
   void NotifyExtensionPreferenceChanged();
 
+  // Sets wither or not folder UI should be enabled. If |folders_enabled| is
+  // false, removes any non-OEM folders.
+  void SetFoldersEnabled(bool folders_enabled);
+
   AppListItemList* top_level_item_list() { return top_level_item_list_.get(); }
 
   SearchBoxModel* search_box() { return search_box_.get(); }
   SearchResults* results() { return results_.get(); }
   Status status() const { return status_; }
+  bool folders_enabled() const { return folders_enabled_; }
 
  private:
   // AppListItemListObserver
   virtual void OnListItemMoved(size_t from_index,
                                size_t to_index,
                                AppListItem* item) OVERRIDE;
 
   // Returns an existing folder matching |folder_id| or creates a new folder.
   AppListFolderItem* FindOrCreateFolderItem(const std::string& folder_id);
 
@@ skipping 20 matching lines @@
   scoped_ptr<AppListItem> RemoveItemFromFolder(AppListFolderItem* folder,
                                                AppListItem* item);
 
   scoped_ptr<AppListItemList> top_level_item_list_;
 
   scoped_ptr<SearchBoxModel> search_box_;
   scoped_ptr<SearchResults> results_;
 
   Status status_;
   ObserverList<AppListModelObserver> observers_;
+  bool folders_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListModel);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_MODEL_H_