app_shell: Add audio and video capture support

extensions/shell/browser/shell_app_window_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_SHELL_APP_WINDOW_CONTROLLER_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_APP_WINDOW_CONTROLLER_H_
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
+class Extension;
 class ShellAppWindow;
 
 class ShellAppWindowController {
  public:
   virtual ~ShellAppWindowController() {}
 
   // Creates a new app window and adds it to the desktop. This class should
   // maintain the ownership of the window.
-  virtual ShellAppWindow* CreateAppWindow(content::BrowserContext* context) = 0;
+  virtual ShellAppWindow* CreateAppWindow(content::BrowserContext* context,
+                                          const Extension* extension) = 0;
 
-  // Closes and destroys the app windows.
+  // Closes and destroys the app windows. Must be called before the extension
+  // is destroyed.
   virtual void CloseAppWindows() = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_APP_WINDOW_CONTROLLER_H_