Example of usage of new features of context and screen.

chrome/browser/chromeos/login/screens/base_screen.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_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_H_
 
 #include <string>
 
 #include "base/basictypes.h"
-#include "chrome/browser/chromeos/login/screens/screen_context.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace chromeos {
 
+class ScreenContext;
+
 // Base class for the all OOBE/login/before-session screens.
 // Screens are identified by ID, screen and it's JS counterpart must have same
 // id.
 // Most of the screens will be re-created for each appearance with Initialize()
 // method called just once. However if initialization is too expensive, screen
 // can override result of IsPermanent() method, and do clean-up upon subsequent
 // Initialize() method calls.
 class BaseScreen {
  public:
   BaseScreen();
@@ skipping 59 matching lines @@
  private:
   friend class ScreenManager;
   void SetContext(ScreenContext* context);
 
   DISALLOW_COPY_AND_ASSIGN(BaseScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_H_