Added to options page to let users change keyboard mappings.

chrome/browser/resources/chromeos/switch_access/options.css

 /* 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. */
 
 #autoScanTimeLabel * {
   clear: left;
   float: left;
 }
+
+.container::after {
+  clear: both;
+  content: '';
+  display: block;
+}
+
+#keyboardMappingDiv * {
+  float: left;
+}
+
+#keyboardMappingDiv label {
+  clear: left;
+}
+
+#keyboardMappingDiv span {
+  white-space: pre-wrap;
+}