Delay wallpaper load by 2 * average wallpaper load time.

chrome/browser/chromeos/login/wallpaper_manager.cc

Index: chrome/browser/chromeos/login/wallpaper_manager.cc
diff --git a/chrome/browser/chromeos/login/wallpaper_manager.cc b/chrome/browser/chromeos/login/wallpaper_manager.cc
index e127b5930d29b8730b2e3b6051169143cd3ea4d3..224d82578ce0bd7b49976594cf9f5641d53c8a7b 100644
--- a/chrome/browser/chromeos/login/wallpaper_manager.cc
+++ b/chrome/browser/chromeos/login/wallpaper_manager.cc
@@ -312,6 +312,7 @@ void WallpaperManager::Observe(int type,
       break;
     }
     case chrome::NOTIFICATION_WALLPAPER_ANIMATION_FINISHED: {
+      NotifyAnimationFinished();
       if (should_cache_wallpaper_) {
         BrowserThread::PostDelayedTask(
             BrowserThread::UI, FROM_HERE,
@@ -605,6 +606,19 @@ void WallpaperManager::UpdateWallpaper() {
   SetUserWallpaper(last_selected_user_);
 }
 
+void WallpaperManager::AddObserver(WallpaperManager::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void WallpaperManager::RemoveObserver(WallpaperManager::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void WallpaperManager::NotifyAnimationFinished() {
+  FOR_EACH_OBSERVER(
+      Observer, observers_, OnWallpaperAnimationFinished(last_selected_user_));
+}
+
 // WallpaperManager, private: --------------------------------------------------
 
 void WallpaperManager::CacheUsersWallpapers() {