Add device policy to disallow shutdown - ash UI modifications

chrome/browser/ui/webui/chromeos/login/core_oobe_handler.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_UI_WEBUI_CHROMEOS_LOGIN_CORE_OOBE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_CORE_OOBE_HANDLER_H_
 
 #include <string>
 
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
@@ skipping 44 matching lines @@
   virtual void OnEnterpriseInfoUpdated(
       const std::string& message_text) override;
 
   // Show or hide OOBE UI.
   void ShowOobeUI(bool show);
 
   bool show_oobe_ui() const {
     return show_oobe_ui_;
   }
 
+  // If |shutdown_button_visible| is true, the shutdown button becomes visible
+  // and the reboot button is hidden. Vice versa if |shutdown_button_visible| is
+  // false.
+  void UpdateShutdownButtonVisibility(bool shutdown_button_visible);
+
  private:
   // CoreOobeActor implementation:
   virtual void ShowSignInError(
       int login_attempts,
       const std::string& error_text,
       const std::string& help_link_text,
       HelpAppLauncher::HelpTopic help_topic_id) override;
   virtual void ShowTpmError() override;
   virtual void ShowSignInUI(const std::string& email) override;
   virtual void ResetSignInUI(bool force_online) override;
@@ skipping 71 matching lines @@
   scoped_ptr<AccessibilityStatusSubscription> accessibility_subscription_;
 
   DemoModeDetector demo_mode_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(CoreOobeHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_CORE_OOBE_HANDLER_H_