MD Settings: focus header when dialog shows to signal to AT what's going on

chrome/test/data/webui/cr_elements/cr_elements_browsertest.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 Tests for shared Polymer elements. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 19 matching lines @@
   },
 
   /** @override */
   setUp: function() {
     PolymerTest.prototype.setUp.call(this);
     // We aren't loading the main document.
     this.accessibilityAuditConfig.ignoreSelectors('humanLangMissing', 'html');
   },
 };
 
+/**
+ * @constructor
+ * @extends {CrElementsBrowserTest}
+ */
 function CrElementsLazyRenderTest() {}
 
 /**
  * @constructor
  * @extends {CrElementsBrowserTest}
  */
 CrElementsLazyRenderTest.prototype = {
   __proto__: CrElementsBrowserTest.prototype,
 
   /** @override */
@@ skipping 118 matching lines @@
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
     'cr_scrollable_behavior_tests.js',
   ]),
 };
 
 TEST_F('CrElementsScrollableBehaviorTest', 'All', function() {
   mocha.run();
 });
 
+/**
+ * @constructor
+ * @extends {CrElementsBrowserTest}
+ */
 function CrElementsPolicyPrefIndicatorTest() {}
 
 CrElementsPolicyPrefIndicatorTest.prototype = {
   __proto__: CrElementsBrowserTest.prototype,
 
   /** @override */
   browsePreload:
       'chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html',
 
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
     'cr_policy_pref_indicator_tests.js',
   ]),
 };
 
 TEST_F('CrElementsPolicyPrefIndicatorTest', 'All', function() {
   mocha.run();
 });
+
+/**
+ * @constructor
+ * @extends {CrElementsBrowserTest}
+ */
+function CrElementsDialogTest() {}
+
+CrElementsDialogTest.prototype = {
+  __proto__: CrElementsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://resources/cr_elements/cr_dialog/cr_dialog.html',
+
+  /** @override */
+  extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    'cr_dialog_test.js',
+  ]),
+};
+
+TEST_F('CrElementsDialogTest', 'All', function() {
+  mocha.run();
+});