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

chrome/browser/resources/chromeos/emulator/input_device_settings.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.
+
+Polymer({
+  is: 'input-device-settings',
+
+  behaviors: [Polymer.NeonAnimatableBehavior],
+
+  /**
+   * @param {!Event} e
+   * Callback when the user toggles the touchpad.
+   */
+  onTouchpadChange: function(e) {
+    chrome.send('setHasTouchpad', [e.target.checked]);
+    this.$.changeDescription.opened = true;
+  },
+
+  /**
+   * @param {!Event} e
+   * Callback when the user toggles the mouse.
+   */
+  onMouseChange: function(e) {
+    chrome.send('setHasMouse', [e.target.checked]);
+    this.$.changeDescription.opened = true;
+  },
+
+  /**
+   * Callback when the existence of a fake mouse changes.
+   * @param {boolean} exists
+   */
+  setMouseExists: function(exists) {
+    this.$.mouse.checked = exists;
+  },
+
+  /**
+   * Callback when the existence of a fake touchpad changes.
+   * @param {boolean} exists
+   */
+  setTouchpadExists: function(exists) {
+    this.$.touchpad.checked = exists;
+  },
+});