UMA for pin unlock success/failure.

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

 // 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.
 
 /**
  * @fileoverview Oobe signin screen implementation.
  */
 
 login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
   // GAIA animation guard timer. Started when GAIA page is loaded
@@ skipping 841 matching lines @@
     /**
      * Invoked when auth is completed successfully.
      * @param {!Object} credentials Credentials of the completed authentication.
      * @private
      */
     onAuthCompleted_: function(credentials) {
       if (credentials.useOffline) {
         this.email = credentials.email;
         chrome.send('authenticateUser',
                     [credentials.email,
-                     credentials.password]);
+                     credentials.password,
+                     false]);
       } else if (credentials.authCode) {
         if (credentials.hasOwnProperty('authCodeOnly') &&
             credentials.authCodeOnly) {
           chrome.send('completeAuthenticationAuthCodeOnly',
                       [credentials.authCode]);
         } else {
           chrome.send('completeAuthentication', [
             credentials.gaiaId,
             credentials.email,
             credentials.password,
@@ skipping 176 matching lines @@
 
       if (show)
         $('gaia-whitelist-error').submitButton.focus();
       else
         Oobe.showSigninUI();
 
       this.updateControlsState();
     }
   };
 });