[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 1058 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 54 matching lines @@
   }
   for (UserList::const_iterator it = users.begin(); it != users.end(); ++it) {
     if (!cros_settings->FindEmailInList(kAccountsPrefUsers, (*it)->email())) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace chromeos