Make the second click on the app shelf icon close the window-list bubble.

ash/shelf/shelf_view.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 ASH_SHELF_SHELF_VIEW_H_
 #define ASH_SHELF_SHELF_VIEW_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 286 matching lines @@
   void ShowMenu(ui::MenuModel* menu_model,
                 views::View* source,
                 const gfx::Point& click_point,
                 bool context_menu,
                 ui::MenuSourceType source_type);
 
   // Overridden from views::BoundsAnimatorObserver:
   void OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) override;
   void OnBoundsAnimatorDone(views::BoundsAnimator* animator) override;
 
-  // Returns false if the click which closed the previous menu is the click
-  // which triggered this event.
-  bool IsUsableEvent(const ui::Event& event);
+  // Returns true if the (press down) |event| is a repost event from an event
+  // which just closed the menu of a shelf item. If it occurs on the same shelf
+  // item, we should ignore the call.
+  bool IsRepostEvent(const ui::Event& event);
 
   // Convenience accessor to model_->items().
   const ShelfItem* ShelfItemForView(const views::View* view) const;
 
   // Returns true if a tooltip should be shown for |view|.
   bool ShouldShowTooltipForView(const views::View* view) const;
 
   // Get the distance from the given |coordinate| to the closest point on this
   // launcher/shelf.
   int CalculateShelfDistance(const gfx::Point& coordinate) const;
@@ skipping 108 matching lines @@
 
   // True when this ShelfView is used for Overflow Bubble.
   bool overflow_mode_;
 
   // Holds a pointer to main ShelfView when a ShelfView is in overflow mode.
   ShelfView* main_shelf_;
 
   // True when ripped item from overflow bubble is entered into Shelf.
   bool dragged_off_from_overflow_to_shelf_;
 
+  // True if the event is a repost event from a event which has just closed the
+  // menu of the same shelf item.
+  bool is_repost_event_;
+
+  // Record the index for the last pressed shelf item. This variable is used to
+  // check if a repost event occurs on the same shelf item as previous one. If
+  // so, the repost event should be ignored.
+  int last_pressed_index_;
+
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_VIEW_H_