Added uma for pin unlock set up.

chrome/browser/resources/settings/people_page/people_page.js

 // Copyright 2015 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
  * 'settings-people-page' is the settings page containing sign-in settings.
  */
 Polymer({
   is: 'settings-people-page',
@@ skipping 246 matching lines @@
     if (this.syncStatus.managed)
       return;
 
     settings.navigateTo(settings.Route.SYNC);
   },
 
 <if expr="chromeos">
   /** @private */
   onConfigureLockTap_: function() {
     settings.navigateTo(settings.Route.LOCK_SCREEN);
+    recordLockScreenProgress(LockScreenProgress.START_SCREEN_LOCK);

[jdufault, 2016/09/13 22:28:35]

I don't think this catches users who navigate directly to the page by typing it
in their address bar: chrome://md-settings/lockScreen.

This stat should probably be recorded by the password prompt dialog show method.

[sammiequon, 2016/09/14 02:00:56]

Done.

   },
 
   /** @private */
   onEasyUnlockSetupTap_: function() {
     this.easyUnlockBrowserProxy_.startTurnOnFlow();
   },
 
   /** @private */
   onEasyUnlockTurnOffTap_: function() {
     this.$$('#easyUnlockTurnOffDialog').open();
@@ skipping 72 matching lines @@
 
   /**
    * @param {string} iconUrl
    * @return {string} A CSS imageset for multiple scale factors.
    * @private
    */
   getIconImageset_: function(iconUrl) {
     return cr.icon.getImage(iconUrl);
   },
 });