Added to options page to let users change keyboard mappings.

chrome/browser/resources/chromeos/switch_access/switch_access.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.
 
 /**
  * Class to manage SwitchAccess and interact with other controllers.
  *
  * @constructor
  * @implements {SwitchAccessInterface}
  */
@@ skipping 102 matching lines @@
   handlePrefsUpdate_: function(event) {
     let updatedPrefs = event.detail;
     for (let key of Object.keys(updatedPrefs)) {
       switch (key) {
         case 'enableAutoScan':
           this.autoScanManager_.setEnabled(updatedPrefs[key]);
           break;
         case 'autoScanTime':
           this.autoScanManager_.setScanTime(updatedPrefs[key]);
           break;
+        default:
+          if (this.switchAccessPrefs.getCommands().includes(key))
+            this.keyboardHandler_.updateSwitchAccessKeys();
       }
     }
   },
 
   /**
    * Move to the next sibling of the current node if it has one.
    *
    * @override
    */
   debugMoveToNext: function() {
@@ skipping 24 matching lines @@
   /**
    * Move to the parent of the current node if it has one.
    *
    * @override
    */
   debugMoveToParent: function() {
     if (this.automationManager_)
       this.automationManager_.debugMoveToParent();
   }
 };