Fix the full screen switching browser window dipping below launcher bar issue.

ash/wm/base_layout_manager.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_WM_BASE_LAYOUT_MANAGER_H_
 #define ASH_WM_BASE_LAYOUT_MANAGER_H_
 #pragma once
 
 #include <set>
 
@@ skipping 32 matching lines @@
   virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
   virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
   virtual void OnChildWindowVisibilityChanged(aura::Window* child,
                                               bool visible) OVERRIDE;
   virtual void SetChildBounds(aura::Window* child,
                               const gfx::Rect& requested_bounds) OVERRIDE;
 
   // RootWindowObserver overrides:
   virtual void OnRootWindowResized(const gfx::Size& new_size) OVERRIDE;
 
+  // RootWindowObserver overrides:
+  virtual void OnScreenWorkAreaInsetsChanged() OVERRIDE;
+
   // WindowObserver overrides:
   virtual void OnWindowPropertyChanged(aura::Window* window,
                                        const void* key,
                                        intptr_t old) OVERRIDE;
 
  private:
   // Update window bounds based on a change in show state.
   void UpdateBoundsFromShowState(aura::Window* window);
 
+  // Adjusts the window sizes when the screen changes its size or its
+  // work area insets.
+  void AdjustWindowSizesForScreenChange();
+
   // Set of windows we're listening to.
   WindowSet windows_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_BASE_LAYOUT_MANAGER_H_