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

chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.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 CHROME_BROWSER_UI_ASH_MULTI_USER_USER_SWITCH_ANIMATOR_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_MULTI_USER_USER_SWITCH_ANIMATOR_CHROMEOS_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 66 matching lines @@
   // Execute the user wallpaper animations for |animation_step|.
   void TransitionWallpaper(AnimationStep animtion_step);
 
   // Execute the user shelf animations for |animation_step|.
   void TransitionUserShelf(AnimationStep animtion_step);
 
   // Execute the window animations for |animation_step|.
   void TransitionWindows(AnimationStep animation_step);
 
   // Check if a window is maximized / fullscreen / covering the entire screen.
-  // TODO(skuhne): We might want to do this on a per screen basis.
-  TransitioningScreenCover GetScreenCover();
+  // If a |root_window| is given, the screen coverage of that root_window is
+  // tested, otherwise all screens.
+  TransitioningScreenCover GetScreenCover(aura::Window* root_window);
 
   // The owning window manager.
   MultiUserWindowManagerChromeOS* owner_;
 
   // The new user to set.
   std::string new_user_id_;
 
   // The animation speed in ms. If 0, animations are disabled.
   int animation_speed_ms_;
 
   // The next animation step for AdvanceUserTransitionAnimation().
   AnimationStep animation_step_;
 
   // The screen cover status before the animation has started.
   TransitioningScreenCover screen_cover_;
 
   // A timer which watches to executes the second part of a "user changed"
   // animation. Note that this timer exists only during such an animation.
   scoped_ptr<base::Timer> user_changed_animation_timer_;
 
   // For unit tests: Check which wallpaper was set.
   std::string wallpaper_user_id_;
 
   DISALLOW_COPY_AND_ASSIGN(UserSwichAnimatorChromeOS);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_ASH_MULTI_USER_USER_SWITCH_ANIMATOR_CHROMEOS_H_