Makes the maximize/restore button handling

ash/shell.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_H_
 #define ASH_SHELL_H_
 #pragma once
 
 #include <utility>
 #include <vector>
@@ skipping 200 matching lines @@
   SystemTrayDelegate* tray_delegate() { return tray_delegate_.get(); }
 
   Launcher* launcher() { return launcher_.get(); }
 
   const ScreenAsh* screen() { return screen_; }
 
   internal::ShelfLayoutManager* shelf() const { return shelf_; }
 
   SystemTray* tray() const { return tray_.get(); }
 
+  // Returns the size of the grid.
+  int GetGridSize() const;
+
   static void set_initially_hide_cursor(bool hide) {
     initially_hide_cursor_ = hide;
   }
 
   // Made available for tests.
   internal::ShadowController* shadow_controller() {
     return shadow_controller_.get();
   }
 
  private:
@@ skipping 90 matching lines @@
   // System tray with clock, Wi-Fi signal, etc. (a replacement in progress for
   // |status_widget_|).
   scoped_ptr<SystemTray> tray_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_