MD Settings: Add "Auto Open" setting to Downloads page UI.

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 539 matching lines @@
     ROOT_PATH + 'ui/webui/resources/js/promise_resolver.js',
     'test_browser_proxy.js',
     'appearance_fonts_page_test.js',
   ]),
 };
 
 TEST_F('CrSettingsAppearanceFontsPageTest', 'All', function() {
   mocha.run();
 });
 
+/**
+ * @constructor
+ * @extends {CrSettingsBrowserTest}
+ */
+function CrSettingsDownloadsPageTest() {}
+
+CrSettingsDownloadsPageTest.prototype = {
+  __proto__: CrSettingsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://md-settings/downloads_page/downloads_page.html',
+
+  /** @override */
+  extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
+    ROOT_PATH + 'ui/webui/resources/js/promise_resolver.js',
+    'test_browser_proxy.js',
+    'downloads_page_test.js',
+  ]),
+};
+
+TEST_F('CrSettingsDownloadsPageTest', 'All', function() {
+  mocha.run();
+});
+
 GEN('#if !defined(OS_CHROMEOS)');
 /**
  * Test fixture for chrome/browser/resources/settings/default_browser_page/.
  * @constructor
  * @extends {CrSettingsBrowserTest}
  */
 function CrSettingsDefaultBrowserTest() {}
 
 CrSettingsDefaultBrowserTest.prototype = {
   __proto__: CrSettingsBrowserTest.prototype,
@@ skipping 810 matching lines @@
 
   /** @override */
   extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
     'focusable_iron_list_item_behavior_test.js',
   ]),
 };
 
 TEST_F('CrSettingsFocusableIronListItemBehavior', 'FocusTest', function() {
   mocha.run();
 });