ShelfID            52 ash/shelf/shelf_item_delegate_manager.h   typedef std::map<ShelfID, ShelfItemDelegate*> ShelfIDToItemDelegateMap;
ShelfID            16 ash/shelf/shelf_item_types.h typedef int ShelfID;
ShelfID            48 ash/shell/window_watcher.h   typedef std::map<ash::ShelfID, aura::Window*> IDToWindow;
ShelfID           412 chrome/browser/ui/ash/launcher/chrome_launcher_controller.h   typedef std::map<ash::ShelfID, LauncherItemController*> IDToItemControllerMap;