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

chrome/browser/chromeos/login/user_manager.cc

Index: chrome/browser/chromeos/login/user_manager.cc
diff --git a/chrome/browser/chromeos/login/user_manager.cc b/chrome/browser/chromeos/login/user_manager.cc
index 3b56995820865b357fa56d6669ff451387731f35..fce8c30a66fcfaba0574eefc27cb370f89b911bc 100644
--- a/chrome/browser/chromeos/login/user_manager.cc
+++ b/chrome/browser/chromeos/login/user_manager.cc
@@ -67,6 +67,8 @@ namespace {
 
 // A vector pref of the users who have logged into the device.
 const char kLoggedInUsers[] = "LoggedInUsers";
+// A dictionary that maps usernames to file paths to their wallpapers.
+const char kUserWallpapers[] = "UserWallpapers";
 // A dictionary that maps usernames to file paths to their images.
 const char kUserImages[] = "UserImages";
 // A dictionary that maps usernames to the displayed (non-canonical) emails.
@@ -74,6 +76,9 @@ const char kUserDisplayEmail[] = "UserDisplayEmail";
 // A dictionary that maps usernames to OAuth token presence flag.
 const char kUserOAuthTokenStatus[] = "OAuthTokenStatus";
 
+// The default wallpaper index.
+const int kDefaultWallpaperIndex = 0;
+
 // Incognito user is represented by an empty string (since some code already
 // depends on that and it's hard to figure out what).
 const char kGuestUser[] = "";
@@ -303,6 +308,8 @@ UserManager* UserManager::Get() {
 // static
 void UserManager::RegisterPrefs(PrefService* local_state) {
   local_state->RegisterListPref(kLoggedInUsers, PrefService::UNSYNCABLE_PREF);
+  local_state->RegisterDictionaryPref(kUserWallpapers,
+                                      PrefService::UNSYNCABLE_PREF);
   local_state->RegisterDictionaryPref(kUserImages,
                                       PrefService::UNSYNCABLE_PREF);
   local_state->RegisterDictionaryPref(kUserOAuthTokenStatus,
@@ -443,6 +450,9 @@ void UserManager::RemoveUserFromList(const std::string& email) {
       user_to_remove = it;
   }
 
+  DictionaryPrefUpdate prefs_wallpapers_update(prefs, kUserWallpapers);
+  prefs_wallpapers_update->RemoveWithoutPathExpansion(email, NULL);
+
   DictionaryPrefUpdate prefs_images_update(prefs, kUserImages);
   std::string image_path_string;
   prefs_images_update->GetStringWithoutPathExpansion(email, &image_path_string);
@@ -839,6 +849,32 @@ void UserManager::SetInitialUserImage(const std::string& username) {
   SaveUserDefaultImageIndex(username, image_id);
 }
 
+int UserManager::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(kUserWallpapers);
+  int index = kDefaultWallpaperIndex;
+  user_wallpapers->GetIntegerWithoutPathExpansion(username,
+            &index);
+  return index;
+}
+
+void UserManager::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, kUserWallpapers);
+  wallpapers_update->SetWithoutPathExpansion(username,
+      new base::FundamentalValue(wallpaper_index));
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_DESKTOP_BACKGROUND_CHANGED,
+      content::Source<UserManager>(this),
+      content::Details<int>(&wallpaper_index));
+}
+
 void UserManager::SetUserImage(const std::string& username,
                                int image_index,
                                const SkBitmap& image) {