MD Settings: Restore focus when exiting various subpages, part 2.

chrome/browser/resources/settings/device_page/device_page.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview 'settings-device-page' is the settings page for device and
  * peripheral settings.
  */
 Polymer({
   is: 'settings-device-page',
@@ skipping 33 matching lines @@
      * Whether power status and settings should be fetched and displayed.
      * @private
      */
     enablePowerSettings_: {
       type: Boolean,
       value: function() {
         return loadTimeData.getBoolean('enablePowerSettings');
       },
       readOnly: true,
     },
+
+    /** @private {!Map<string, string>} */
+    focusConfig_: {
+      type: Object,
+      value: function() {
+        var map = new Map();
+        map.set(
+            settings.Route.POINTERS.path, '#pointersRow .subpage-arrow');
+        map.set(
+            settings.Route.KEYBOARD.path, '#keyboardRow .subpage-arrow');
+        map.set(
+            settings.Route.STYLUS.path, '#stylusRow .subpage-arrow');
+        map.set(
+            settings.Route.DISPLAY.path, '#displayRow .subpage-arrow');
+        map.set(
+            settings.Route.STORAGE.path, '#storageRow .subpage-arrow');
+        map.set(
+            settings.Route.POWER.path, '#powerRow .subpage-arrow');
+        return map;
+      },
+    },
   },
 
   observers: [
     'pointersChanged_(hasMouse_, hasTouchpad_)',
   ],
 
   /** @override */
   attached: function() {
     this.addWebUIListener(
         'has-mouse-changed', this.set.bind(this, 'hasMouse_'));
@@ skipping 88 matching lines @@
    * @private
    */
   checkPointerSubpage_: function() {
     // Check that the properties have explicitly been set to false.
     if (this.hasMouse_ === false && this.hasTouchpad_ === false &&
         settings.getCurrentRoute() == settings.Route.POINTERS) {
       settings.navigateTo(settings.Route.DEVICE);
     }
   },
 });