MD Settings: Lazy load the contents of the "advanced" settings.

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

-// Copyright 2017 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 settings-idle-render. */
-
-/** @const {string} Path to root from chrome/test/data/webui/settings/. */
-var ROOT_PATH = '../../../../../';
-
-/**
- * @constructor
- * @extends testing.Test
- */
-function SettingsIdleRenderBrowserTest() {}
-
-SettingsIdleRenderBrowserTest.prototype = {
-  __proto__: testing.Test.prototype,
-
-  /** @override */
-  browsePreload: 'chrome://md-settings/controls/setting_idle_render.html',
-
-  /** @override */
-  extraLibraries: [
-    ROOT_PATH + 'third_party/mocha/mocha.js',
-    '../mocha_adapter.js',
-  ],
-
-  /** @override */
-  isAsync: true,
-
-  /** @override */
-  runAccessibilityChecks: false,
-};
-
-TEST_F('SettingsIdleRenderBrowserTest', 'render', function() {
-  // Register mocha tests.
-  suite('Settings idle render tests', function() {
-    setup(function() {
-      var template =
-          '<template is="settings-idle-render" id="idleTemplate">' +
-          '  <div>' +
-          '  </div>' +
-          '</template>';
-      document.body.innerHTML = template;
-      // The div should not be initially accesible.
-      assertFalse(!!document.body.querySelector('div'));
-    });
-
-    test('stamps after get()', function() {
-      // Calling get() will force stamping without waiting for idle time.
-      var inner = document.getElementById('idleTemplate').get();
-      assertEquals('DIV', inner.nodeName);
-      assertEquals(inner, document.body.querySelector('div'));
-    });
-
-    test('stamps after idle', function(done) {
-      requestIdleCallback(function() {
-        // After JS calls idle-callbacks, this should be accesible.
-        assertTrue(!!document.body.querySelector('div'));
-        done();
-      });
-    });
-  });
-
-  // Run all registered tests.
-  mocha.run();
-});