[cros] Add Ctrl+Alt+E shortcut to Welcome/EULA screen that cancels update and starts with enrollment

chrome/browser/chromeos/login/update_screen.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_CHROMEOS_LOGIN_UPDATE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UPDATE_SCREEN_H_
 #pragma once
 
 #include <set>
 
@@ skipping 20 matching lines @@
   virtual ~UpdateScreen();
 
   // Overridden from WizardScreen.
   virtual void PrepareToShow() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
 
   // UpdateScreenActor::Delegate implementation:
   virtual void CancelUpdate() OVERRIDE;
   virtual void OnActorDestroyed(UpdateScreenActor* actor) OVERRIDE;
+  virtual void SkipUpdateEnrollAfterEula() OVERRIDE;
 
   // Checks for updates and performs an update if needed. Made virtual to
   // simplify mocking.
   virtual void StartUpdate();
 
   // Reboot check delay get/set, in seconds.
   int reboot_check_delay() const { return reboot_check_delay_; }
   void SetRebootCheckDelay(int seconds);
 
   // Returns true if this instance is still active (i.e. has not been deleted).
@@ skipping 55 matching lines @@
 
   // Keeps actor which is delegated with all showing operations.
   UpdateScreenActor* actor_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UPDATE_SCREEN_H_