[ash-md] Adjusts animation of the selector after closing an overview item

ash/common/wm/overview/window_grid.h

 // Copyright 2014 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_COMMON_WM_OVERVIEW_WINDOW_GRID_H_
 #define ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 73 matching lines @@
   // Returns true if a window is contained in any of the WindowSelectorItems
   // this grid owns.
   bool Contains(const WmWindow* window) const;
 
   // Dims the items whose titles do not contain |pattern| and prevents their
   // selection. The pattern has its accents removed and is converted to
   // lowercase in a l10n sensitive context.
   // If |pattern| is empty, no item is dimmed.
   void FilterItems(const base::string16& pattern);
 
+  // Called when |window| is about to get closed. If the |window| is currently
+  // selected the implementation fades out |selection_widget_| to transparent
+  // opacity, effectively hiding the selector widget.
+  void WindowClosing(WindowSelectorItem* window);
+
   // Returns true if the grid has no more windows.
   bool empty() const { return window_list_.empty(); }
 
   // Returns how many window selector items are in the grid.
   size_t size() const { return window_list_.size(); }
 
   // Returns true if the selection widget is active.
   bool is_selecting() const { return selection_widget_ != nullptr; }
 
   // Returns the root window in which the grid displays the windows.
@@ skipping 70 matching lines @@
 
   // Number of columns in the grid.
   size_t num_columns_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowGrid);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_