Enable device disabling during normal operation

chrome/browser/chromeos/login/screens/device_disabled_screen_actor.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_SCREENS_DEVICE_DISABLED_SCREEN_ACTOR_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_DEVICE_DISABLED_SCREEN_ACTOR_H_
 
 #include <string>
 
 namespace chromeos {
@@ skipping 11 matching lines @@
     // destroyed first, it must call SetDelegate(nullptr).
     virtual void OnActorDestroyed(DeviceDisabledScreenActor* actor) = 0;
   };
 
   virtual ~DeviceDisabledScreenActor() {
   }
 
   virtual void Show(const std::string& message) = 0;
   virtual void Hide() = 0;
   virtual void SetDelegate(Delegate* delegate) = 0;
+  virtual void UpdateMessage(const std::string& message) = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_DEVICE_DISABLED_SCREEN_ACTOR_H_