Enable user change background image in settings page in Aura build.

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 19 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[];
 
+  // A dictionary that maps usernames to file paths to their wallpapers.
+  static const char kUserWallpapers[];
+
   // A dictionary that maps usernames to file paths to their images.
   static const char kUserImages[];
 
   // A dictionary that maps usernames to the displayed (non-canonical) emails.
   static const char kUserDisplayEmail[];
 
   // A dictionary that maps usernames to OAuth token presence flag.
   static const char kUserOAuthTokenStatus[];
 
   // Returns a shared instance of a UserManager. Not thread-safe, should only be
@@ skipping 56 matching lines @@
   // Ignored If there is no such user.
   virtual void SaveUserDisplayEmail(const std::string& username,
                                     const std::string& display_email) = 0;
 
   // Returns the display email for user |username| if it is known (was
   // previously set by a |SaveUserDisplayEmail| call).
   // Otherwise, returns |username| itself.
   virtual std::string GetUserDisplayEmail(
       const std::string& username) const = 0;
 
+  // Returns the index of the default wallpapers saved in local state for user
+  // |username| if it is known (was previousely set by
+  // |SaveWallpaperToLocalState| call).
+  // Otherwise, returns default wallpaper index.
+  virtual int GetUserWallpaper(const std::string& username) = 0;
+
+  // Sets user wallpaper to the default wallpaper with index |wallpaper_index|,
+  // updates Local State.
+  virtual void SaveWallpaperDefaultIndex(const std::string& username,
+                                         int wallpaper_index) = 0;
+
   // Sets user image to the default image with index |image_index|, sends
   // LOGIN_USER_IMAGE_CHANGED notification and updates Local State.
   virtual void SaveUserDefaultImageIndex(const std::string& username,
                                          int image_index) = 0;
 
   // Saves image to file, sends LOGIN_USER_IMAGE_CHANGED notification and
   // updates Local State.
   virtual void SaveUserImage(const std::string& username,
                              const SkBitmap& image) = 0;
 
@@ skipping 40 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_