Ignore fullscreen windows which are behind other windows for fullscreen mode.

ash/wm/workspace/workspace_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_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_H_
 #define ASH_WM_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_H_
 
 #include <set>
 
 #include "ash/shell_observer.h"
@@ skipping 37 matching lines @@
   virtual void SetChildBounds(aura::Window* child,
                               const gfx::Rect& requested_bounds) OVERRIDE;
 
   // ash::ShellObserver overrides:
   virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
 
   // Overriden from WindowObserver:
   virtual void OnWindowPropertyChanged(aura::Window* window,
                                        const void* key,
                                        intptr_t old) OVERRIDE;
+  virtual void OnWindowStackingChanged(aura::Window* window) OVERRIDE;
 
   // ash::WindowSettings::Observer overrides:
   virtual void OnTrackedByWorkspaceChanged(wm::WindowState* window_state,
                                            bool old) OVERRIDE;
 
   // WindowStateObserver overrides:
   virtual void OnWindowShowTypeChanged(wm::WindowState* window_state,
                                        wm::WindowShowType old_type) OVERRIDE;
 
  private:
   // Overridden from BaseLayoutManager:
   virtual void ShowStateChanged(wm::WindowState* window_state,
                                 ui::WindowShowState last_show_state) OVERRIDE;
   virtual void AdjustAllWindowsBoundsForWorkAreaChange(
       AdjustWindowReason reason) OVERRIDE;
   virtual void AdjustWindowBoundsForWorkAreaChange(
       wm::WindowState* window_state,
       AdjustWindowReason reason) OVERRIDE;
 
   void AdjustWindowBoundsWhenAdded(wm::WindowState* window_state);
 
   void UpdateDesktopVisibility();
+  void UpdateFullscreenState();
 
   // Updates the bounds of the window for a show state change from
   // |last_show_state|.
   void UpdateBoundsFromShowState(wm::WindowState* window_state,
                                  ui::WindowShowState last_show_state);
 
   // If |window_state| is maximized or fullscreen the bounds of the
   // window are set and true is returned. Does nothing otherwise.
   bool SetMaximizedOrFullscreenBounds(wm::WindowState* window_state);
 
   // Adjusts the |bounds| so that they are flush with the edge of the
   // workspace if the window represented by |window_state| is side snapped.
   void AdjustSnappedBounds(wm::WindowState* window_state, gfx::Rect* bounds);
 
   // Animates the window bounds to |bounds|.
   void SetChildBoundsAnimated(aura::Window* child, const gfx::Rect& bounds);
 
   internal::ShelfLayoutManager* shelf_;
   aura::Window* window_;
 
   // The work area. Cached to avoid unnecessarily moving windows during a
   // workspace switch.
   gfx::Rect work_area_in_parent_;
 
+  // True if this workspace is currently in fullscreen mode.
+  bool is_fullscreen_;
+
   DISALLOW_COPY_AND_ASSIGN(WorkspaceLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_H_