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

chrome/browser/chromeos/login/screen_observer.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_SCREEN_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_OBSERVER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 26 matching lines @@
     ENTERPRISE_AUTO_MAGIC_ENROLLMENT_COMPLETED,
     EXIT_CODES_COUNT  // not a real code, must be the last
   };
 
   // Method called by a screen when user's done with it.
   virtual void OnExit(ExitCodes exit_code) = 0;
 
   // Forces current screen showing.
   virtual void ShowCurrentScreen() = 0;
 
+  // Skip update, go straight to enrollment after EULA is accepted.
+  virtual void SkipUpdateEnrollAfterEula() = 0;
+
   // Notify about new user names and password. It is used to autologin
   // just created user without asking the same info once again.
   virtual void OnSetUserNamePassword(const std::string& username,
                                      const std::string& password) = 0;
 
   // Set/get usage statistics reporting checkbox status on EULA screen.
-  virtual void set_usage_statistics_reporting(bool val) = 0;
-  virtual bool usage_statistics_reporting() const = 0;
+  virtual void SetUsageStatisticsReporting(bool val) = 0;
+  virtual bool GetUsageStatisticsReporting() const = 0;
 
  protected:
   virtual ~ScreenObserver() {}
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_OBSERVER_H_