[cros] Fake a stub user login when no --login-manager and --login-user are given.

chrome/browser/chromeos/login/user_manager.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_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 22 matching lines @@
     // Called when the local state preferences is changed
     virtual void LocalStateChanged(UserManager* user_manager) = 0;
 
    protected:
     virtual ~Observer() {}
   };
 
   // A vector pref of the users who have logged into the device.
   static const char kLoggedInUsers[];
 
+  // Username for stub login when not running on ChromeOS.
+  static const char kStubUser[];
+
   // A dictionary that maps usernames to file paths to their wallpapers.
   // Deprecated. Will remove this const char after done migration.
   static const char kUserWallpapers[];
 
   // A dictionary that maps usernames to wallpaper properties.
   static const char kUserWallpapersProperties[];
 
   // A dictionary that maps usernames to file paths to their images.
   static const char kUserImages[];
 
@@ skipping 200 matching lines @@
   virtual void NotifyLocalStateChanged() = 0;
 
   // Returns the result of the last successful profile image download, if any.
   // Otherwise, returns an empty bitmap.
   virtual const SkBitmap& DownloadedProfileImage() const = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_