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

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

Index: chrome/browser/ui/webui/signin/login_ui_service.h
diff --git a/chrome/browser/ui/webui/signin/login_ui_service.h b/chrome/browser/ui/webui/signin/login_ui_service.h
index b6d070c53378b4f748eae7069f1b51277058a8f9..db8808362efbb0c24e30fa905ad105bcb573372d 100644
--- a/chrome/browser/ui/webui/signin/login_ui_service.h
+++ b/chrome/browser/ui/webui/signin/login_ui_service.h
@@ -79,12 +79,19 @@ class LoginUIService : public KeyedService {
   // 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_;
@@ -96,6 +103,7 @@ class LoginUIService : public KeyedService {
   base::ObserverList<Observer> observer_list_;
 
   base::string16 last_login_result_;
+  base::string16 last_login_error_username_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginUIService);
 };