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 3692a2acafa4b939a5842cc4274123a8646b26d4..7235f64df4ba275c6c896f7e36fa5fc00af68bb9 100644
--- a/chrome/browser/chromeos/login/wallpaper_manager.cc
+++ b/chrome/browser/chromeos/login/wallpaper_manager.cc
@@ -299,6 +299,7 @@ void WallpaperManager::Observe(int type,
       break;
     }
     case chrome::NOTIFICATION_WALLPAPER_ANIMATION_FINISHED: {
+      NotifyAnimationFinished();
       if (should_cache_wallpaper_) {
         BrowserThread::PostDelayedTask(
             BrowserThread::UI, FROM_HERE,
@@ -591,6 +592,33 @@ void WallpaperManager::UpdateWallpaper() {
   SetUserWallpaper(last_selected_user_);
 }
 
+void WallpaperManager::AddObserver(
+    base::WeakPtr<WallpaperManager::Observer> observer) {
+  ObserverList::iterator i = observers_.begin();
+  while (i != observers_.end()) {
+    if (*i != NULL) {
+      if (i->get() == observer.get())
+        return;
+      ++i;
+      continue;
+    }
+    observers_.erase(i++);
+  }
+  observers_.push_back(observer);
+}
+
+void WallpaperManager::NotifyAnimationFinished() {
+  ObserverList::iterator i = observers_.begin();
+  while (i != observers_.end()) {
+    if (*i != NULL) {
+      (*i)->OnWallpaperAnimationFinished(last_selected_user_);
+      ++i;
+      continue;
+    }
+    observers_.erase(i++);
+  }
+}
+
 // WallpaperManager, private: --------------------------------------------------
 
 void WallpaperManager::CacheUsersWallpapers() {