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

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

Index: chrome/browser/ui/webui/signin/login_ui_service.cc
diff --git a/chrome/browser/ui/webui/signin/login_ui_service.cc b/chrome/browser/ui/webui/signin/login_ui_service.cc
index cb4a81aa046a405aaf0b85dc5a8d481ce49b9335..7ea28d896730cd22173573b661341f04ef135bba 100644
--- a/chrome/browser/ui/webui/signin/login_ui_service.cc
+++ b/chrome/browser/ui/webui/signin/login_ui_service.cc
@@ -65,6 +65,10 @@ void LoginUIService::ShowLoginPopup() {
 #endif
 }
 
+void LoginUIService::SetLastLoginErrorUsername(const base::string16& username) {
+  last_login_error_username_ = username;
+}
+
 void LoginUIService::DisplayLoginResult(Browser* browser,
                                         const base::string16& message) {
 #if defined(OS_CHROMEOS)
@@ -72,13 +76,21 @@ void LoginUIService::DisplayLoginResult(Browser* browser,
   NOTREACHED();
 #endif
   last_login_result_ = message;
-  browser->window()->ShowAvatarBubbleFromAvatarButton(
-      message.empty() ? BrowserWindow::AVATAR_BUBBLE_MODE_CONFIRM_SIGNIN
-                      : BrowserWindow::AVATAR_BUBBLE_MODE_SHOW_ERROR,
-      signin::ManageAccountsParams(),
-      signin_metrics::AccessPoint::ACCESS_POINT_EXTENSIONS);
+  if (switches::IsMaterialDesignUserMenu() && !message.empty()) {
+    browser->ShowModalSigninErrorWindow();
+  } else {
+    browser->window()->ShowAvatarBubbleFromAvatarButton(
+        message.empty() ? BrowserWindow::AVATAR_BUBBLE_MODE_CONFIRM_SIGNIN
+                        : BrowserWindow::AVATAR_BUBBLE_MODE_SHOW_ERROR,
+        signin::ManageAccountsParams(),
+        signin_metrics::AccessPoint::ACCESS_POINT_EXTENSIONS);
+  }
 }
 
 const base::string16& LoginUIService::GetLastLoginResult() {
   return last_login_result_;
 }
+
+const base::string16& LoginUIService::GetLastLoginErrorUsername() {
+  return last_login_error_username_;
+}