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

chrome/browser/chromeos/login/user_manager_impl.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/user_manager_impl.h"
 
 #include <vector>
 
+#include "ash/desktop_background/desktop_background_resources.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/rand_util.h"
@@ skipping 412 matching lines @@
   UserList::iterator user_to_remove = users_.end();
   for (UserList::iterator it = users_.begin(); it != users_.end(); ++it) {
     std::string user_email = (*it)->email();
     // Skip user that we would like to delete.
     if (email != user_email)
       prefs_users_update->Append(Value::CreateStringValue(user_email));
     else
       user_to_remove = it;
   }
 
+  DictionaryPrefUpdate prefs_wallpapers_update(prefs,
+                                               UserManager::kUserWallpapers);
+  prefs_wallpapers_update->RemoveWithoutPathExpansion(email, NULL);
+
   DictionaryPrefUpdate prefs_images_update(prefs, UserManager::kUserImages);
   std::string image_path_string;
   prefs_images_update->GetStringWithoutPathExpansion(email, &image_path_string);
   prefs_images_update->RemoveWithoutPathExpansion(email, NULL);
 
   DictionaryPrefUpdate prefs_oauth_update(prefs,
                                           UserManager::kUserOAuthTokenStatus);
   int oauth_status;
   prefs_oauth_update->GetIntegerWithoutPathExpansion(email, &oauth_status);
   prefs_oauth_update->RemoveWithoutPathExpansion(email, NULL);
@@ skipping 379 matching lines @@
                           base::Bind(&UserManagerImpl::CheckOwnership,
                                      base::Unretained(this)));
 }
 
 void UserManagerImpl::SetInitialUserImage(const std::string& username) {
   // Choose a random default image.
   int image_id = base::RandInt(0, kDefaultImagesCount - 1);
   SaveUserDefaultImageIndex(username, image_id);
 }
 
+int UserManagerImpl::GetUserWallpaper(const std::string& username) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  PrefService* local_state = g_browser_process->local_state();
+  const DictionaryValue* user_wallpapers =
+      local_state->GetDictionary(UserManager::kUserWallpapers);
+  int index = ash::GetPresetWallpaperIndex();
+  user_wallpapers->GetIntegerWithoutPathExpansion(username,
+                                                  &index);
+  return index;
+}
+
+void UserManagerImpl::SaveWallpaperDefaultIndex(const std::string& username,
+                                                int wallpaper_index) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  PrefService* local_state = g_browser_process->local_state();
+  DictionaryPrefUpdate wallpapers_update(local_state,
+                                         UserManager::kUserWallpapers);
+  wallpapers_update->SetWithoutPathExpansion(username,
+      new base::FundamentalValue(wallpaper_index));
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_DESKTOP_BACKGROUND_CHANGED,

[Ben Goodger (Google), 2012/03/09 23:20:17]

can you not use notifications for this at all... rather use an api ash exposes
to change the wallpaper.

[bshe, 2012/03/12 00:14:25]

Done.

+      content::Source<UserManagerImpl>(this),
+      content::Details<int>(&wallpaper_index));
+}
+
 void UserManagerImpl::SetUserImage(const std::string& username,
                                int image_index,
                                const SkBitmap& image) {
   User* user = const_cast<User*>(FindUser(username));
   // User may have been removed by now.
   if (user) {
     // For existing users, a valid image index should have been set upon loading
     // them from Local State.
     DCHECK(user->image_index() != User::kInvalidImageIndex ||
            is_current_user_new_);
@@ skipping 213 matching lines @@
 
 User* UserManagerImpl::CreateUser(const std::string& email) const {
   User* user = new User(email, email == kGuestUser);
   user->set_oauth_token_status(LoadUserOAuthStatus(email));
   // Used to determine whether user's display name is unique.
   ++display_name_count_[user->GetDisplayName()];
   return user;
 }
 
 }  // namespace chromeos