Close AppWindow to perform clean shutdown

extensions/shell/browser/desktop_controller.h

 // Copyright 2014 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 EXTENSIONS_SHELL_BROWSER_DESKTOP_CONTROLLER_H_
 #define EXTENSIONS_SHELL_BROWSER_DESKTOP_CONTROLLER_H_
 
 namespace aura {
 class Window;
 class WindowTreeHost;
 }
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
+class AppWindow;
 class Extension;
 class ShellAppWindow;
 
 // DesktopController is an interface to construct the window environment in
 // extensions shell. ShellDesktopController provides a default implementation
 // for
 // app_shell, and embedder (such as athena) can provide its own.
 class DesktopController {
  public:
   DesktopController();
   virtual ~DesktopController();
 
   // Returns the single instance of the desktop. (Stateless functions like
   // ShellAppWindowCreateFunction need to be able to access the desktop, so
   // we need a singleton somewhere).
   static DesktopController* instance();
 
   // Returns the WindowTreeHost created by this DesktopController.
   virtual aura::WindowTreeHost* GetHost() = 0;
 
+  // Creates a new ShellAppWindow and adds it to the desktop. The desktop
+  // maintains ownership of the window. The window must be closed before
+  // |extension| is destroyed.
+  virtual ShellAppWindow* CreateShellAppWindow(content::BrowserContext* context,
+                                               const Extension* extension) = 0;
+
   // Creates a new app window and adds it to the desktop. The desktop maintains
   // ownership of the window. The window must be closed before |extension| is
   // destroyed.
-  virtual ShellAppWindow* CreateAppWindow(content::BrowserContext* context,
-                                          const Extension* extension) = 0;
+  virtual AppWindow* CreateAppWindow(content::BrowserContext* context,
+                                     const Extension* extension) = 0;
 
   // Attaches the window to our window hierarchy.
   virtual void AddAppWindow(aura::Window* window) = 0;
 
   // Closes and destroys the app windows.
   virtual void CloseAppWindows() = 0;
 };
 
 }  // namespace extensinos
 
 #endif  // EXTENSIONS_SHELL_BROWSER_DESKTOP_CONTROLLER_H_