[MD settings] show icon when slider controlled by something

chrome/test/data/webui/cr_elements/settings_private_test_constants.js

Index: chrome/test/data/webui/cr_elements/settings_private_test_constants.js
diff --git a/chrome/test/data/webui/cr_elements/settings_private_test_constants.js b/chrome/test/data/webui/cr_elements/settings_private_test_constants.js
new file mode 100644
index 0000000000000000000000000000000000000000..cb281b1c69b9ae86599c418a660a3b5d3f4ddb01
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+++ b/chrome/test/data/webui/cr_elements/settings_private_test_constants.js
@@ -0,0 +1,33 @@
+// 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.
+
+// Define chrome.settingsPrivate enums, normally provided by chrome WebUI.
+// NOTE: These need to be kept in sync with settings_private.idl.
+
+chrome.settingsPrivate = chrome.settingsPrivate || {};
+
+/** @enum {string} */
+chrome.settingsPrivate.ControlledBy = {
+  DEVICE_POLICY: 'DEVICE_POLICY',
+  USER_POLICY: 'USER_POLICY',
+  OWNER: 'OWNER',
+  PRIMARY_USER: 'PRIMARY_USER',
+  EXTENSION: 'EXTENSION',
+};
+
+/** @enum {string} */
+chrome.settingsPrivate.Enforcement = {
+  ENFORCED: 'ENFORCED',
+  RECOMMENDED: 'RECOMMENDED',
+};
+
+/** @enum {string} */
+chrome.settingsPrivate.PrefType = {
+  BOOLEAN: 'BOOLEAN',
+  NUMBER: 'NUMBER',
+  STRING: 'STRING',
+  URL: 'URL',
+  LIST: 'LIST',
+  DICTIONARY: 'DICTIONARY',
+};