[ash] Add TYPE_DIALOG and its item's LauncherContextMenu

ash/shelf/shelf_window_watcher_item_delegate.h

Index: ash/shelf/shelf_window_watcher_item_delegate.h
diff --git a/ash/shelf/shelf_window_watcher_item_delegate.h b/ash/shelf/shelf_window_watcher_item_delegate.h
index 24723114e5ee3a53ae9add72bc3c8794191d22cd..7a40f638c5b63db9e4e733ea5dcc33bd06031353 100644
--- a/ash/shelf/shelf_window_watcher_item_delegate.h
+++ b/ash/shelf/shelf_window_watcher_item_delegate.h
@@ -14,18 +14,18 @@ class Window;
 }
 
 namespace ash {
+
+class ShelfModel;
+
 namespace internal {
 
 // ShelfItemDelegate for the items created by ShelfWindowWatcher.
 class ShelfWindowWatcherItemDelegate : public ShelfItemDelegate {
  public:
-  explicit ShelfWindowWatcherItemDelegate(aura::Window* window);
+  ShelfWindowWatcherItemDelegate(aura::Window* window, ShelfModel* model_);
 
   virtual ~ShelfWindowWatcherItemDelegate();
 
-  // Closes the window associated with this item.
-  void Close();
-
  private:
   // ShelfItemDelegate overrides:
   virtual bool ItemSelected(const ui::Event& event) OVERRIDE;
@@ -34,10 +34,14 @@ class ShelfWindowWatcherItemDelegate : public ShelfItemDelegate {
   virtual ShelfMenuModel* CreateApplicationMenu(int event_flags) OVERRIDE;
   virtual bool IsDraggable() OVERRIDE;
   virtual bool ShouldShowTooltip() OVERRIDE;
+  virtual void Close() OVERRIDE;
 
   // Stores a Window associated with this item. Not owned.
   aura::Window* window_;
 
+  // Not owned.
+  ShelfModel* model_;
+
   DISALLOW_COPY_AND_ASSIGN(ShelfWindowWatcherItemDelegate);
 };