Load webview based GAIA in hidden state and pass focus when ready

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

 // Copyright 2013 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/gaia_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 770 matching lines @@
     PrefService* prefs = g_browser_process->local_state();
     if (prefs->GetBoolean(prefs::kFactoryResetRequested)) {
       core_oobe_actor_->ShowDeviceResetScreen();
     } else if (prefs->GetBoolean(prefs::kDebuggingFeaturesRequested)) {
       core_oobe_actor_->ShowEnableDebuggingScreen();
     }
   }
 }
 
 void GaiaScreenHandler::MaybePreloadAuthExtension() {
-  // TODO(rsorokin): Revert that when issue with hidden webview load will be
-  // fixed.
-  if (StartupUtils::IsWebviewSigninEnabled())
-    return;
   VLOG(1) << "MaybePreloadAuthExtension() call.";
 
   // If cookies clearing was initiated or |dns_clear_task_running_| then auth
   // extension showing has already been initiated and preloading is senseless.
   if (signin_screen_handler_->ShouldLoadGaia() &&
       !gaia_silent_load_ &&
       !cookies_cleared_ &&
       !dns_clear_task_running_ &&
       network_state_informer_->state() == NetworkStateInformer::ONLINE) {
     gaia_silent_load_ = true;
@@ skipping 36 matching lines @@
 SigninScreenHandlerDelegate* GaiaScreenHandler::Delegate() {
   DCHECK(signin_screen_handler_);
   return signin_screen_handler_->delegate_;
 }
 
 void GaiaScreenHandler::SetSigninScreenHandler(SigninScreenHandler* handler) {
   signin_screen_handler_ = handler;
 }
 
 }  // namespace chromeos