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

chrome/browser/ui/webui/signin/login_ui_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_H_
 #define CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_H_
 
 #include <list>
 
 #include "base/macros.h"
@@ skipping 61 matching lines @@
 
   // Called when the sync confirmation UI is closed. |result| indicates the
   // option chosen by the user in the confirmation UI.
   void SyncConfirmationUIClosed(SyncConfirmationUIClosedResult result);
 
   // Delegate to an existing login dialog if one exists.
   // If not, we make a new popup dialog window, and set it to
   // chrome://signin to ask the user to sign in to chrome.
   void ShowLoginPopup();
 
+  // Sets the last email used for signing in when a signin error occured.
+  void SetLastLoginErrorUsername(const base::string16& username);

[anthonyvd, 2016/08/22 14:58:46]

Since username == email here, maybe we should pick one and stick with it
everywhere (including comments). I'd prefer email since it's what we're actually
passing but either is fine as long as it's consistent.

[Jane, 2016/08/22 20:48:31]

Done.

+
   // Displays login results.
   void DisplayLoginResult(Browser* browser, const base::string16& message);
 
   // Gets the last login result set through |DisplayLoginResult|.
   const base::string16& GetLastLoginResult();
 
+  // Gets the last email used for login when a login error occured; set through
+  // |SetLastLoginUsername|.
+  const base::string16& GetLastLoginErrorUsername();

[anthonyvd, 2016/08/22 14:58:46]

Same as above.

[Jane, 2016/08/22 20:48:31]

Done.

+
  private:
   // Weak pointers to the recently opened UIs, with the most recent in front.
   std::list<LoginUI*> ui_list_;
 #if !defined(OS_CHROMEOS)
   Profile* profile_;
 #endif
 
   // List of observers.
   base::ObserverList<Observer> observer_list_;
 
   base::string16 last_login_result_;
+  base::string16 last_login_error_username_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginUIService);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_H_