Added auto-scan, made some small changes to how prefs are stored, refactored.

chrome/browser/resources/chromeos/switch_access/closure_support.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.
 
 /**
- * Stubs out extension API types and functions, and DOM elements, so
- * SwitchAccessUnitTest can load.
+ * Shortcuts for variable type declarations in closure compiler.
  */
-chrome.automation = {};
+let AutomationNode = chrome.automation.AutomationNode;

[dmazzoni, 2017/03/29 05:52:20]

This doesn't look like a shortcut for the Closure Compiler anymore.
I think it'd be better to delete this file and put this in any scoped block
where it'd be useful for readability.

[elichtenberg, 2017/03/29 19:15:11]

Done. Creating scopes caused some issues with closure, so just used full type
name in annotations.