Delay wallpaper load by 2 * average wallpaper load time.

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

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
index 9a85f0a86ff62e4d7d46430e5866aa4d8c56766d..add7fd253b17ee1686b429863c4b89452cfd6311 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
@@ -423,6 +423,7 @@ SigninScreenHandler::SigninScreenHandler(
 }
 
 SigninScreenHandler::~SigninScreenHandler() {
+  WallpaperManager::Get()->RemoveObserver(this);
   weak_factory_.InvalidateWeakPtrs();
   SystemKeyEventListener* key_event_listener =
       SystemKeyEventListener::GetInstance();
@@ -553,8 +554,10 @@ void SigninScreenHandler::ShowRetailModeLoginSpinner() {
 
 void SigninScreenHandler::SetDelegate(SigninScreenHandlerDelegate* delegate) {
   delegate_ = delegate;
-  if (delegate_)
+  if (delegate_) {
     delegate_->SetWebUIHandler(this);
+    WallpaperManager::Get()->AddObserver(this);

[dzhioev (left Google), 2013/10/17 12:47:49]

Why do you add observer here? I see that |this| added as observer to network
state informer in constructor. I don't know which way is correct though.

[Alexander Alekseev, 2013/10/18 17:01:52]

Hmmm... I don't reember why, but there was a reason. Probably the reason has
gone. Moved to constructor.

+  }
 }
 
 void SigninScreenHandler::SetNativeWindowDelegate(
@@ -1284,6 +1287,11 @@ void SigninScreenHandler::HandleLoadWallpaper(const std::string& email) {
     delegate_->LoadWallpaper(email);
 }
 
+void SigninScreenHandler::OnWallpaperAnimationFinished(
+    const std::string& email) {
+  CallJS("login.AccountPickerScreen.onWallpaperLoaded", email);
+}
+
 void SigninScreenHandler::HandleRebootSystem() {
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RequestRestart();
 }