Show progress bar as soon as update state changed to UPDATE_STATUS_UPDATE_AVAILABLE

chrome/browser/chromeos/login/update_screen_actor.h

 // Copyright (c) 2011 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_UPDATE_SCREEN_ACTOR_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UPDATE_SCREEN_ACTOR_H_
 #pragma once
 
 namespace chromeos {
 
@@ skipping 13 matching lines @@
   virtual void PrepareToShow() = 0;
 
   // Shows manual reboot info message.
   virtual void ShowManualRebootInfo() = 0;
 
   // Sets current progress in percents.
   virtual void SetProgress(int progress) = 0;
 
   // Shows screen curtains.
   virtual void ShowCurtain(bool enable) = 0;
+
+  // Shows label for "Preparing updates" state.
+  virtual void ShowPreparingUpdatesInfo(bool visible) = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UPDATE_SCREEN_ACTOR_H_