MD Settings: Adding some unit tests for <settings-main>.

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 664 matching lines @@
 
 TEST_F('CrSettingsNonExistentRouteTest', 'All', function() {
   suite('NonExistentRoutes', function() {
     test('redirect to basic', function() {
       assertEquals(settings.Route.BASIC, settings.getCurrentRoute());
       assertEquals('/', location.pathname);
     });
   });
   mocha.run();
 });
+
+/**
+ * Test fixture for chrome/browser/resources/settings/settings_main/.
+ * @constructor
+ * @extends {CrSettingsBrowserTest}
+*/
+function CrSettingsMainPageTest() {}
+
+CrSettingsMainPageTest.prototype = {
+  __proto__: CrSettingsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://md-settings/settings_main/settings_main.html',
+
+  /** @override */
+  extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
+    'settings_main_test.js',
+  ]),
+};
+
+TEST_F('CrSettingsMainPageTest', 'All', function() {
+  settings_main_page.registerTests();
+  mocha.run();
+});