Reauthenticate the user before launching Smart Lock setup app.

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

 // Copyright (c) 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/signin_screen_handler.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/shell.h"
@@ skipping 1224 matching lines @@
   if (prefs->GetBoolean(prefs::kFactoryResetRequested)) {
     if (core_oobe_actor_) {
       core_oobe_actor_->ShowDeviceResetScreen();
       return;
     }
   }
 
   is_account_picker_showing_first_time_ = true;
   gaia_screen_handler_->MaybePreloadAuthExtension();
 
+  ScreenlockBridge::Get()->SetLockHandler(this);
   if (ScreenLocker::default_screen_locker()) {
     ScreenLocker::default_screen_locker()->delegate()->OnLockWebUIReady();
   }
-  ScreenlockBridge::Get()->SetLockHandler(this);
 
   if (delegate_)
     delegate_->OnSigninScreenReady();
 }
 
 void SigninScreenHandler::HandleWallpaperReady() {
   if (ScreenLocker::default_screen_locker()) {
     ScreenLocker::default_screen_locker()->delegate()->
         OnLockBackgroundDisplayed();
   }
@@ skipping 327 matching lines @@
   return gaia_screen_handler_->frame_error();
 }
 
 void SigninScreenHandler::OnCapsLockChanged(bool enabled) {
   caps_lock_enabled_ = enabled;
   if (page_is_ready())
     CallJS("login.AccountPickerScreen.setCapsLockState", caps_lock_enabled_);
 }
 
 }  // namespace chromeos