Added to options page to let users change keyboard mappings.

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

Index: chrome/browser/resources/chromeos/switch_access/options.html
diff --git a/chrome/browser/resources/chromeos/switch_access/options.html b/chrome/browser/resources/chromeos/switch_access/options.html
index ab5ddc8ac4d7687f7b674415e357d55e9208ba34..21abcdfbd8d703f07a1abf08b34a9a3fda03df69 100644
--- a/chrome/browser/resources/chromeos/switch_access/options.html
+++ b/chrome/browser/resources/chromeos/switch_access/options.html
@@ -16,13 +16,48 @@
       Enable auto-scan
     </label>
   </div>
-  <div>
+  <div class="container">
     <!-- TODO(elichtenberg) i18n for pref ids -->
     <label id="autoScanTimeLabel">
       <span>Set auto-scan time in seconds:</span>
       <input id="autoScanTime" type="number" min=".05" step=".05" value="1">
     </label>
   </div>
+  <h2>Keyboard Mapping</h2>
+  <div id="keyboardMappingDiv" class="container">
+    <label>
+      <span>Next: </span>
+      <input id="next" type="text" maxlength="1">
+    </label>
+    <label>
+      <span>Previous: </span>
+      <input id="previous" type="text" maxlength="1">
+    </label>
+    <label>
+      <span>Select: </span>
+      <input id="select" type="text" maxlength="1">
+    </label>
+    <label>
+      <span>Options: </span>
+      <input id="options" type="text" maxlength="1">
+    </label>
+    <label>

[dmazzoni, 2017/06/15 22:37:39]

How about hiding these? Maybe we could make a secret url that makes these
visible but not show them by default.

As Switch Access is getting more polished I think it'd be good to turn off
the debug key bindings by default but still allow them for people who want them.

[elichtenberg, 2017/06/20 01:02:30]

Set display to none for debug options, and removed default key bindings

+      <span>Debug Next: </span>
+      <input id="debugNext" type="text" maxlength="1">
+    </label>
+    <label>
+      <span>Debug Previous: </span>
+      <input id="debugPrevious" type="text" maxlength="1">
+    </label>
+    <label>
+      <span>Debug Child: </span>
+      <input id="debugChild" type="text" maxlength="1">
+    </label>
+    <label>
+      <span>Debug Parent: </span>
+      <input id="debugParent" type="text" maxlength="1">
+    </label>
+  </div>
   <script type="text/javascript" src="options.js"></script>
 </body>
 </html>