Avoiding double resize of maximized windows upon user switch due to showing and hiding of the shelf

ash/shelf/shelf_widget.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_WIDGET_H_
 #define ASH_SHELF_SHELF_WIDGET_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf/background_animator.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
@@ skipping 27 matching lines @@
   static bool ShelfAlignmentAllowed();
 
   void SetAlignment(ShelfAlignment alignmnet);
   ShelfAlignment GetAlignment() const;
 
   // Sets the shelf's background type.
   void SetPaintsBackground(ShelfBackgroundType background_type,
                            BackgroundAnimatorChangeType change_type);
   ShelfBackgroundType GetBackgroundType() const;
 
+  // Hide the shelf behind a black bar during e.g. a user transition when |hide|
+  // is true. The |animation_time_ms| will be used as animation duration.
+  void HideShelfBehindBlackBar(bool hide, int animation_time_ms);
+  bool IsShelfHiddenBehindBlackBar() const;
+
   // Causes shelf items to be slightly dimmed (e.g. when a window is maximized).
   void SetDimsShelf(bool dimming);
   bool GetDimsShelf() const;
 
   ShelfLayoutManager* shelf_layout_manager() { return shelf_layout_manager_; }
   Shelf* shelf() const { return shelf_.get(); }
   StatusAreaWidget* status_area_widget() const { return status_area_widget_; }
 
   void CreateShelf();
 
@@ skipping 46 matching lines @@
   // during CloseChildWindows of the associated RootWindowController.
   DelegateView* delegate_view_;
   BackgroundAnimator background_animator_;
   bool activating_as_fallback_;
   aura::Window* window_container_;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WIDGET_H_