chrome/browser/resources/chromeos/switch_access/background.js

// Copyright 2017 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.

/**
 * Initializes SwitchAccess and adds it to the extension's background page.
 *
 * @type {SwitchAccess}
 */
window.switchAccess = new SwitchAccess();