Example of usage of new features of context and screen.

chrome/browser/chromeos/login/ui/oobe_display.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 CHROME_BROWSER_CHROMEOS_LOGIN_UI_OOBE_DISPLAY_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_OOBE_DISPLAY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 
 namespace chromeos {
 
 class AppLaunchSplashScreenActor;
+class AutoEnrollmentCheckScreenActor;
 class CoreOobeActor;
+class ControllerPairingScreenActor;
 class EnrollmentScreenActor;
 class ErrorScreenActor;
 class EulaScreenActor;
 class HIDDetectionScreenActor;
 class KioskAutolaunchScreenActor;
 class KioskEnableScreenActor;
+class LocallyManagedUserCreationScreenHandler;
 class NetworkScreenActor;
 class ResetScreenActor;
 class TermsOfServiceScreenActor;
 class UpdateScreenActor;
 class UserImageScreenActor;
-// TODO(altimofeev): use real actors instead
-class ViewScreenDelegate;
-class WizardScreen;
 class WrongHWIDScreenActor;
-class AutoEnrollmentCheckScreenActor;
-class LocallyManagedUserCreationScreenHandler;
 
 // Interface which is used by WizardController to do actual OOBE screens
 // showing. Also it provides actors for the OOBE screens.
 class OobeDisplay {
  public:
   enum Screen {
     SCREEN_OOBE_HID_DETECTION = 0,
     SCREEN_OOBE_NETWORK,
     SCREEN_OOBE_EULA,
     SCREEN_OOBE_UPDATE,
     SCREEN_OOBE_ENROLLMENT,
     SCREEN_OOBE_RESET,
     SCREEN_GAIA_SIGNIN,
     SCREEN_ACCOUNT_PICKER,
     SCREEN_KIOSK_AUTOLAUNCH,
     SCREEN_KIOSK_ENABLE,
     SCREEN_ERROR_MESSAGE,
     SCREEN_USER_IMAGE_PICKER,
     SCREEN_TPM_ERROR,
     SCREEN_PASSWORD_CHANGED,
     SCREEN_CREATE_MANAGED_USER_DIALOG,
     SCREEN_CREATE_MANAGED_USER_FLOW,
     SCREEN_TERMS_OF_SERVICE,
     SCREEN_WRONG_HWID,
     SCREEN_AUTO_ENROLLMENT_CHECK,
     SCREEN_APP_LAUNCH_SPLASH,
     SCREEN_CONFIRM_PASSWORD,
     SCREEN_FATAL_ERROR,
+    SCREEN_OOBE_CONTROLLER_PAIRING,
     SCREEN_UNKNOWN
   };
 
   virtual ~OobeDisplay() {}
 
-  // Shows the given screen.
-  virtual void ShowScreen(WizardScreen* screen) = 0;
-
-  // Hides the given screen.
-  virtual void HideScreen(WizardScreen* screen) = 0;
-
   // Pointers to actors which should be used by the specific screens. Actors
   // must be owned by the OobeDisplay implementation.
   virtual CoreOobeActor* GetCoreOobeActor() = 0;
   virtual UpdateScreenActor* GetUpdateScreenActor() = 0;
   virtual NetworkScreenActor* GetNetworkScreenActor() = 0;
   virtual EulaScreenActor* GetEulaScreenActor() = 0;
   virtual EnrollmentScreenActor* GetEnrollmentScreenActor() = 0;
   virtual ResetScreenActor* GetResetScreenActor() = 0;
   virtual KioskAutolaunchScreenActor* GetKioskAutolaunchScreenActor() = 0;
   virtual KioskEnableScreenActor* GetKioskEnableScreenActor() = 0;
   virtual TermsOfServiceScreenActor* GetTermsOfServiceScreenActor() = 0;
   virtual UserImageScreenActor* GetUserImageScreenActor() = 0;
   virtual ErrorScreenActor* GetErrorScreenActor() = 0;
   virtual WrongHWIDScreenActor* GetWrongHWIDScreenActor() = 0;
   virtual AutoEnrollmentCheckScreenActor*
       GetAutoEnrollmentCheckScreenActor() = 0;
   virtual HIDDetectionScreenActor* GetHIDDetectionScreenActor() = 0;
   virtual LocallyManagedUserCreationScreenHandler*
       GetLocallyManagedUserCreationScreenActor() = 0;
   virtual AppLaunchSplashScreenActor* GetAppLaunchSplashScreenActor() = 0;
+  virtual ControllerPairingScreenActor* GetControllerPairingScreenActor() = 0;
 
   // Returns if JS side is fully loaded and ready to accept messages.
   // If |false| is returned, then |display_is_ready_callback| is stored
   // and will be called once display is ready.
   virtual bool IsJSReady(const base::Closure& display_is_ready_callback) = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_OOBE_DISPLAY_H_