UMA for pin unlock success/failure.

chrome/browser/resources/chromeos/login/login_shared.js

 // 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.
 
 /**
  * @fileoverview Common OOBE controller methods. This method is shared between
  * OOBE, login, and the lock screen. Add only methods that need to be shared
  * between all *three* screens here, as each additional method increases the
  * time it takes to show the lock screen.
  *
@@ skipping 317 matching lines @@
     chrome.send('launchIncognito');
   };
 
   /**
    * Authenticate for telemetry - used for screenlocker.
    * @param {string} username Login username.
    * @param {string} password Login password.
    */
   Oobe.authenticateForTesting = function(username, password) {
     Oobe.disableSigninUI();
-    chrome.send('authenticateUser', [username, password]);
+    chrome.send('authenticateUser', [username, password, false]);
   };
 
   /**
    * Gaia login screen for telemetry.
    */
   Oobe.addUserForTesting = function() {
     Oobe.skipToLoginForTesting();
     chrome.send('addUser');
   };
 
@@ skipping 72 matching lines @@
 
 
 (function() {
   'use strict';
 
   document.addEventListener('DOMContentLoaded', function() {
     Oobe.initialize();
   });
 })();