Delay wallpaper load by 2 * average wallpaper load time.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index 6f977d14fe9399c197eaac85d43754e03b3502d9..de83887e2bebc39515398291c3e05335e6b48b54 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -17,6 +17,7 @@
 #include "chrome/browser/chromeos/login/login_display.h"
 #include "chrome/browser/chromeos/login/screens/error_screen_actor.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
+#include "chrome/browser/chromeos/login/wallpaper_manager.h"
 #include "chrome/browser/chromeos/net/network_portal_detector.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/chromeos/system_key_event_listener.h"
@@ -173,7 +174,8 @@ class SigninScreenHandler
       public LoginDisplayWebUIHandler,
       public SystemKeyEventListener::CapsLockObserver,
       public content::NotificationObserver,
-      public NetworkStateInformer::NetworkStateInformerObserver {
+      public NetworkStateInformer::NetworkStateInformerObserver,
+      public WallpaperManager::Observer {
  public:
   SigninScreenHandler(
       const scoped_refptr<NetworkStateInformer>& network_state_informer,
@@ -201,6 +203,9 @@ class SigninScreenHandler
   // Required Local State preferences.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
+  // From WallpaperManager::Observer
+  void OnWallpaperAnimationFinished(const std::string& email) OVERRIDE;
+
  private:
   enum UIState {
     UI_STATE_UNKNOWN = 0,
@@ -450,6 +455,8 @@ class SigninScreenHandler
 
   base::WeakPtrFactory<SigninScreenHandler> weak_factory_;
 
+  base::WeakPtrFactory<WallpaperManager::Observer> weak_factory_as_observer_;
+
   // Set to true once |LOGIN_WEBUI_VISIBLE| notification is observed.
   bool webui_visible_;
   bool preferences_changed_delayed_;