MD Settings: Add remapping options for Backspace and Escape

chrome/test/data/webui/settings/device_page_tests.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.
 
 cr.define('device_page_tests', function() {
   /** @enum {string} */
   var TestNames = {
     DevicePage: 'device page',
     Display: 'display',
     Keyboard: 'keyboard',
@@ skipping 89 matching lines @@
           remap_caps_lock_key_to: {
             key: 'settings.language.remap_caps_lock_key_to',
             type: chrome.settingsPrivate.PrefType.NUMBER,
             value: 4,
           },
           remap_diamond_key_to: {
             key: 'settings.language.remap_diamond_key_to',
             type: chrome.settingsPrivate.PrefType.NUMBER,
             value: 3,
           },
+          remap_escape_key_to: {
+            key: 'settings.language.remap_escape_key_to',
+            type: chrome.settingsPrivate.PrefType.NUMBER,
+            value: 5,
+          },
+          remap_backspace_key_to: {
+            key: 'settings.language.remap_backspace_key_to',
+            type: chrome.settingsPrivate.PrefType.NUMBER,
+            value: 6,
+          },
           send_function_keys: {
             key: 'settings.language.send_function_keys',
             type: chrome.settingsPrivate.PrefType.BOOLEAN,
             value: false,
           },
           xkb_auto_repeat_enabled_r2: {
             key: 'prefs.settings.language.xkb_auto_repeat_enabled_r2',
             type: chrome.settingsPrivate.PrefType.BOOLEAN,
             value: true,
           },
@@ skipping 392 matching lines @@
         expectTrue(displayPage.showMirror_(displayPage.displays));
         expectTrue(displayPage.isMirrored_(displayPage.displays));
       });
     });
   });
 
   return {
     TestNames: TestNames
   };
 });