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

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index f12e0db8f6fe451570c1422cf726c24c9b2ba245..196e515ffdb488348cc5b9b37e73f2c4497a2f4f 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -6,6 +6,7 @@
 
 #include <vector>
 
+#include "ash/desktop_background/desktop_background_resources.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ -438,6 +439,10 @@ void UserManagerImpl::RemoveUserFromList(const std::string& email) {
       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);
@@ -837,6 +842,33 @@ void UserManagerImpl::SetInitialUserImage(const std::string& username) {
   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) {