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:
@@ skipping 33 matching lines @@
   // workspace switch.
   gfx::Rect work_area_in_parent_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_H_