Makes the maximize/restore button handling

ash/shell/window_type_launcher.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_SHELL_WINDOW_TYPE_LAUNCHER_H_
 #define ASH_SHELL_WINDOW_TYPE_LAUNCHER_H_
 #pragma once
 
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/button.h"
@@ skipping 33 matching lines @@
 
   // Overridden from views::View:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
 
   // Overridden from views::WidgetDelegate:
   virtual views::View* GetContentsView() OVERRIDE;
   virtual bool CanResize() const OVERRIDE;
   virtual string16 GetWindowTitle() const OVERRIDE;
+  virtual bool CanMaximize() const OVERRIDE;
 
   // Overridden from views::ButtonListener:
   virtual void ButtonPressed(views::Button* sender,
                              const views::Event& event) OVERRIDE;
 
 #if !defined(OS_MACOSX)
   // Overridden from views::MenuDelegate:
   virtual void ExecuteCommand(int id) OVERRIDE;
 
   // Override from views::ContextMenuController:
@@ skipping 16 matching lines @@
   scoped_ptr<views::MenuRunner> menu_runner_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(WindowTypeLauncher);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_WINDOW_TYPE_LAUNCHER_H_