Refactors building the system menu model into a common place

chrome/browser/ui/views/frame/browser_desktop_root_window_host.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 CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_ROOT_WINDOW_HOST_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_ROOT_WINDOW_HOST_H_
 
 class BrowserFrame;
 class BrowserView;
 namespace gfx {
@@ skipping 15 matching lines @@
   static BrowserDesktopRootWindowHost* CreateBrowserDesktopRootWindowHost(
       views::internal::NativeWidgetDelegate* native_widget_delegate,
       views::DesktopNativeWidgetAura* desktop_native_widget_aura,
       const gfx::Rect& initial_bounds,
       BrowserView* browser_view,
       BrowserFrame* browser_frame);
 
   virtual views::DesktopRootWindowHost* AsDesktopRootWindowHost() = 0;
 
   virtual int GetMinimizeButtonOffset() const = 0;
+
+  // Returns true if the OS takes care of showing the system menu. Returning
+  // false means BrowserFrame handles showing the system menu.
+  virtual bool UsesNativeSystemMenu() const = 0;
 };
 
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_ROOT_WINDOW_HOST_H_