[Signin Error Dialog] (3/3) Added the triggering code

chrome/browser/ui/signin_view_controller.cc

 // Copyright 2016 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/signin_view_controller.h"
 
 #include "chrome/browser/ui/signin_view_controller_delegate.h"
 #include "components/signin/core/common/profile_management_switches.h"
 
 SigninViewController::SigninViewController()
@@ skipping 17 matching lines @@
 
 void SigninViewController::ShowModalSyncConfirmationDialog(Browser* browser) {
   CloseModalSignin();
   // The delegate will delete itself on request of the UI code when the widget
   // is closed.
   signin_view_controller_delegate_ =
       SigninViewControllerDelegate::CreateSyncConfirmationDelegate(this,
                                                                    browser);
 }
 
+void SigninViewController::ShowModalSigninErrorDialog(Browser* browser) {
+  CloseModalSignin();
+  // The delegate will delete itself on request of the UI code when the widget
+  // is closed.
+  signin_view_controller_delegate_ =
+      SigninViewControllerDelegate::CreateSigninErrorDelegate(this, browser);
+}
+
 void SigninViewController::CloseModalSignin() {
   if (signin_view_controller_delegate_)
     signin_view_controller_delegate_->CloseModalSignin();
 
   DCHECK(!signin_view_controller_delegate_);
 }
 
 void SigninViewController::SetModalSigninHeight(int height) {
   if (signin_view_controller_delegate_)
     signin_view_controller_delegate_->ResizeNativeView(height);
 }
 
 void SigninViewController::ResetModalSigninDelegate() {
   signin_view_controller_delegate_ = nullptr;
 }
 
 // static
 bool SigninViewController::ShouldShowModalSigninForMode(
     profiles::BubbleViewMode mode) {
   return switches::UsePasswordSeparatedSigninFlow() &&
          (mode == profiles::BUBBLE_VIEW_MODE_GAIA_SIGNIN ||
           mode == profiles::BUBBLE_VIEW_MODE_GAIA_ADD_ACCOUNT ||
           mode == profiles::BUBBLE_VIEW_MODE_GAIA_REAUTH);
 }