Settings Router Refactor: Update subpage-back button to use history back sometimes.

chrome/test/data/webui/settings/cr_settings_browsertest.js

 // Copyright 2015 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 Runs the Polymer Settings tests. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 540 matching lines @@
  * @constructor
  * @extends {CrSettingsBrowserTest}
 */
 function CrSettingsSubpageTest() {}
 
 CrSettingsSubpageTest.prototype = {
   __proto__: CrSettingsBrowserTest.prototype,
 
   /** @override */
   browsePreload: 'chrome://md-settings/settings_page/settings_subpage.html',
+
+  extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
+    'settings_subpage_test.js',
+  ]),
 };
 
 TEST_F('CrSettingsSubpageTest', 'SettingsSubpage', function() {
-  suite('SettingsSubpage', function() {
-    test('can navigate to parent', function() {
-      PolymerTest.clearBody();
-
-      settings.navigateTo(settings.Route.SYNC);
-      assertEquals(settings.Route.SYNC, settings.getCurrentRoute());
-
-      var subpage = document.createElement('settings-subpage');
-      document.body.appendChild(subpage);
-
-      MockInteractions.tap(subpage.$$('paper-icon-button'));
-      assertEquals(settings.Route.PEOPLE, settings.getCurrentRoute());
-    });
-  });
-
+  settings_subpage.registerTests();
   mocha.run();
 });
 
 GEN('#if !defined(OS_CHROMEOS)');
 /**
  * @constructor
  * @extends {CrSettingsBrowserTest}
 */
 function CrSettingsSystemPageTest() {}
 
@@ skipping 206 matching lines @@
   browsePreload: 'chrome://md-settings/controls/controlled_radio_button.html',
 
   extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
     'controlled_radio_button_tests.js',
   ]),
 };
 
 TEST_F('CrControlledRadioButtonTest', 'All', function() {
   mocha.run();
 });