[cros] Initialize OOBE in parallel when boot animation is disabled.

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 1040 matching lines @@
 void SigninScreenHandler::HandleCreateAccount(const base::ListValue* args) {
   if (delegate_)
     delegate_->CreateAccount();
 }
 
 void SigninScreenHandler::HandleOpenProxySettings(const base::ListValue* args) {
   BaseLoginDisplayHost::default_host()->OpenProxySettings();
 }
 
 void SigninScreenHandler::HandleLoginVisible(const base::ListValue* args) {
-  content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_LOGIN_WEBUI_VISIBLE,
-      content::NotificationService::AllSources(),
-      content::NotificationService::NoDetails());
+  if (!webui_visible_) {
+    // There might be multiple messages from OOBE UI so send notifications after
+    // the first one only.
+    content::NotificationService::current()->Notify(
+        chrome::NOTIFICATION_LOGIN_WEBUI_VISIBLE,
+        content::NotificationService::AllSources(),
+        content::NotificationService::NoDetails());
+  }
+  webui_visible_ = true;
   if (ScreenLocker::default_screen_locker())
     web_ui()->CallJavascriptFunction("login.AccountPickerScreen.setWallpaper");
 }
 
 void SigninScreenHandler::StartClearingDnsCache() {
   if (dns_clear_task_running_ || !g_browser_process->io_thread())
     return;
 
   dns_cleared_ = false;
   BrowserThread::PostTaskAndReply(
@@ skipping 31 matching lines @@
       !dns_clear_task_running_ &&
       network_state_informer_->is_online()) {
     gaia_silent_load_ = true;
     gaia_silent_load_network_ =
         network_state_informer_->active_network_service_path();
     LoadAuthExtension(true, true, false);
   }
 }
 
 }  // namespace chromeos