Added uma for pin unlock set up.

chrome/browser/resources/options/browser_options.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.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{actionLinkText: (string|undefined),
  *            childUser: (boolean|undefined),
  *            hasError: (boolean|undefined),
@@ skipping 419 matching lines @@
         $('change-picture-caption').onclick = this.showImagerPickerOverlay_;
 
         $('manage-accounts-button').onclick = function(event) {
           PageManager.showPageByName('accounts');
           chrome.send('coreOptionsUserMetricsAction',
               ['Options_ManageAccounts']);
         };
 
         if (loadTimeData.getBoolean('showQuickUnlockSettings')) {
           $('manage-screenlock').onclick = function(event) {
             PageManager.showPageByName('quickUnlockConfigureOverlay');

[jdufault, 2016/09/13 18:36:05]

nit: indentation

[sammiequon, 2016/09/13 19:21:40]

Done.

+        chrome.send('metricsHandler:recordInHistogram',
+            [PinUnlockUmaHistogramName, PinUnlockSetupType.START_SCREEN_LOCK,
+             PinUnlockSetupType.MAX_BUCKET]);
           };
           $('manage-screenlock').hidden = false;
         }
       } else {
         $('import-data').onclick = function(event) {
           ImportDataOverlay.show();
           chrome.send('coreOptionsUserMetricsAction', ['Import_ShowDlg']);
         };
 
         if ($('themes-native-button')) {
@@ skipping 1960 matching lines @@
 
       settings.hidden = !isVisible;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });