Add settings screen that lets a user setup a PIN to unlock their device with.

chrome/browser/resources/settings/settings_page/settings_router.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.
 
 /**
  * @typedef {{
  *   dialog: (string|undefined),
  *   page: string,
  *   section: string,
  *   subpage: !Array<string>,
@@ skipping 203 matching lines @@
       section: 'people',
       subpage: ['quick-unlock-authenticate'],
     },
     {
       url: '/quickUnlock/chooseMethod',
       page: 'basic',
       section: 'people',
       subpage: ['quick-unlock-choose-method'],
     },
     {
+      url: '/quickUnlock/setupPin',
+      page: 'basic',
+      section: 'people',
+      subpage: ['quick-unlock-choose-method', 'quick-unlock-setup-pin'],
+    },
+    {
       url: '/accounts',
       page: 'basic',
       section: 'people',
       subpage: ['users'],
     },
 </if>
     {
       url: '/privacy',
       page: 'advanced',
       section: 'privacy',
@@ skipping 408 matching lines @@
           window.history.replaceState(historicRoute, document.title);
         }
 
         return;
       }
     }
 
     assertNotReached('Route not found: ' + JSON.stringify(newRoute));
   },
 });