[MD settings] show icon when slider controlled by something

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 109 matching lines @@
 function CrElementsSliderTest() {}
 
 CrElementsSliderTest.prototype = {
   __proto__: CrElementsBrowserTest.prototype,
 
   /** @override */
   browsePreload: 'chrome://resources/cr_elements/cr_slider/cr_slider.html',
 
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    'settings_private_test_constants.js',
     'cr_slider_tests.js',
   ]),
 };
 
 TEST_F('CrElementsSliderTest', 'All', function() {
   cr_slider.registerTests();
   mocha.run();
 });
 
 /**
@@ skipping 71 matching lines @@
 
 CrElementsPolicyPrefIndicatorTest.prototype = {
   __proto__: CrElementsBrowserTest.prototype,
 
   /** @override */
   browsePreload:
       'chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html',
 
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    'settings_private_test_constants.js',
     'cr_policy_strings.js',
     'cr_policy_pref_indicator_tests.js',
   ]),
 };
 
 TEST_F('CrElementsPolicyPrefIndicatorTest', 'All', function() {
   mocha.run();
 });
 
 /**
@@ skipping 10 matching lines @@
 
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
     'cr_dialog_test.js',
   ]),
 };
 
 TEST_F('CrElementsDialogTest', 'All', function() {
   mocha.run();
 });