Enable device disabling during normal operation

chrome/browser/ui/webui/chromeos/login/device_disabled_screen_handler.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_UI_WEBUI_CHROMEOS_LOGIN_DEVICE_DISABLED_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_DEVICE_DISABLED_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/screens/device_disabled_screen_actor.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 
 namespace chromeos {
 
 // WebUI implementation of DeviceDisabledScreenActor.
 class DeviceDisabledScreenHandler : public DeviceDisabledScreenActor,
                                     public BaseScreenHandler {
  public:
   DeviceDisabledScreenHandler();
   ~DeviceDisabledScreenHandler() override;
 
   // DeviceDisabledScreenActor:
   void Show(const std::string& message) override;
   void Hide() override;
   void SetDelegate(Delegate* delegate) override;
+  void UpdateMessage(const std::string& message) override;
 
   // BaseScreenHandler:
   void DeclareLocalizedValues(LocalizedValuesBuilder* builder) override;
   void Initialize() override;
 
  private:
   // WebUIMessageHandler:
   void RegisterMessages() override;
 
   Delegate* delegate_;
 
   // Indicates whether the screen should be shown right after initialization.
   bool show_on_init_;
 
   // The message to show to the user.
   std::string message_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceDisabledScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_DEVICE_DISABLED_SCREEN_HANDLER_H_