Wire up an api to darken screen for accessibility

chrome/browser/resources/chromeos/chromevox/cvox2/background/stubs.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.
-
-/**
- * @fileoverview Installs stubs for unsupported api's on some platforms. Define
- * the stubs here and require Stubs in the calling file.
- */
-
-goog.provide('Stubs');
-
-goog.require('cvox.ChromeVox');
-
-/** Initializes this module. */
-Stubs.init = function() {
-  // These api's throw for non-Chrome OS.
-  if (!cvox.ChromeVox.isChromeOS) {
-    chrome.accessibilityPrivate.onAccessibilityGesture = {};
-    chrome.accessibilityPrivate.onAccessibilityGesture.addListener =
-        function() {};
-    chrome.accessibilityPrivate.setFocusRing = function() {};
-    chrome.accessibilityPrivate.setKeyboardListener = function() {};
-  }
-
-  // This api throws on Mac.
-  if (cvox.ChromeVox.isMac) {
-    chrome.automation.getDesktop = function() {};
-  }
-
-  // Missing api's until 53.
-  if (!chrome.automation.NameFromType) {
-    chrome.automation['NameFromType'] = {};
-    chrome.automation['DescriptionFromType'] = {};
-  }
-};
-
-Stubs.init();