Use fake Input Device Settings with chrome://device-emulator

chrome/browser/resources/chromeos/emulator/device_emulator_pages.js

 // Copyright 2016 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('device_emulator', {
   audioSettings: null,
   batterySettings: null,
   bluetoothSettings: null,
 });
 
 Polymer({
   is: 'device-emulator-pages',
 
   properties: {
     selectedPage: {
       type: Number,
       value: 0,
     },
   },
 
   ready: function() {
-    for (var page of Polymer.dom(this.$$('neon-animated-pages')).children) {
-      page.initialize();
+    for (var page of Polymer.dom(this.$$('neon-animated-pages')).children)
       device_emulator[page.id] = page;
-    }
 
     chrome.send('initializeDeviceEmulator');
   },
 });