MD Settings: Add mouse settings, update pointer settings

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 {{
  *   url: string,
  *   page: string,
  *   section: string,
  *   subpage: !Array<string>,
@@ skipping 528 matching lines @@
     {
       url: '/device',
       page: 'basic',
       section: 'device',
       subpage: [],
     },
     {
       url: '/pointer-overlay',
       page: 'basic',
       section: 'device',
-      subpage: ['touchpad'],
+      subpage: ['pointers'],
     },
     {
       url: '/keyboard-overlay',
       page: 'basic',
       section: 'device',
       subpage: ['keyboard'],
     },
     {
       url: '/display',
       page: 'basic',
@@ skipping 58 matching lines @@
           window.history.replaceState(historicState, document.title);
         }
 
         return;
       }
     }
 
     assertNotReached('Route not found: ' + JSON.stringify(newRoute));
   },
 });