Do not create workspace for fullscreen.

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 52 matching lines @@
                                        const void* key,
                                        intptr_t old) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
   virtual void OnWindowBoundsChanged(aura::Window* window,
                                      const gfx::Rect& old_bounds,
                                      const gfx::Rect& new_bounds) OVERRIDE;
 
  private:
   typedef std::set<aura::Window*> WindowSet;
 
-  // Invoked when the show state of a window changes. |cloned_layer| is a clone
-  // of the windows layer tree. |cloned_layer| is only non-NULL if a cross fade
-  // should happen between the states. This method takes ownership of
-  // |cloned_layer|.
+  // Invoked when the show state of a window changes.
   void ShowStateChanged(aura::Window* window,
-                        ui::WindowShowState last_show_state,
-                        ui::Layer* cloned_layer);
+                        ui::WindowShowState last_show_state);
 
   enum AdjustWindowReason {
     ADJUST_WINDOW_SCREEN_SIZE_CHANGED,
     ADJUST_WINDOW_DISPLAY_INSETS_CHANGED,
     ADJUST_WINDOW_WINDOW_ADDED
   };
 
   // Adjusts the sizes of the windows during a screen change. If this is called
   // for a screen size change (i.e. |reason| is
   // ADJUST_WINDOW_SCREEN_SIZE_CHANGED), the non-maximized/non-fullscreen
@@ skipping 27 matching lines @@
   // workspace switch.
   gfx::Rect work_area_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_H_