Update add user button dynamically after policy push

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 <stddef.h>
 
 #include <algorithm>
 #include <vector>
@@ skipping 1051 matching lines @@
     // to be disabled. We need to show the add user page.
     HandleShowAddUser(nullptr);
     return;
   }
 
   if (delegate_->AllowNewUserChanged() || ui_state_ == UI_STATE_UNKNOWN) {
     // We need to reload GAIA if UI_STATE_UNKNOWN or the allow new user setting
     // has changed so that reloaded GAIA shows/hides the option to create a new
     // account.
     UpdateUIState(UI_STATE_ACCOUNT_PICKER, nullptr);
+    UpdateAddButtonStatus();
   }
 }
 
 void SigninScreenHandler::ResetSigninScreenHandlerDelegate() {
   SetDelegate(nullptr);
 }
 
 void SigninScreenHandler::ShowError(int login_attempts,
                                     const std::string& error_text,
                                     const std::string& help_link_text,
@@ skipping 573 matching lines @@
   rate.initial_delay_in_ms = auto_repeat_delay;
   rate.repeat_interval_in_ms = auto_repeat_interval;
   input_method::InputMethodManager::Get()
       ->GetImeKeyboard()
       ->SetAutoRepeatEnabled(true);
   input_method::InputMethodManager::Get()->GetImeKeyboard()->SetAutoRepeatRate(
       rate);
 }
 
 }  // namespace chromeos