WebUI: Add cr-policy-pref-indicator tests

ui/webui/resources/cr_elements/policy/cr_policy_pref_indicator.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 Polymer element for indicating policies that apply to an
  * element controlling a settings preference.
  */
 Polymer({
   is: 'cr-policy-pref-indicator',
 
   behaviors: [CrPolicyIndicatorBehavior, CrPolicyPrefBehavior],
 
   properties: {
     /**
      * Optional preference object associated with the indicator. Initialized to
      * null so that computed functions will get called if this is never set.
-     * @type {!chrome.settingsPrivate.PrefObject|undefined}
+     * @type {?chrome.settingsPrivate.PrefObject}
      */
-    pref: Object,
+    pref: {
+      type: Object,
+      value: null,
+    },
 
     /**
-     * Which indicator type to show (or NONE).
+     * Which indicator type to show (or NONE). This may be set explicitly, or
+     * computed if |pref| is set.
      * @type {CrPolicyIndicatorType}
      */
     indicatorType: {
       type: String,
       value: CrPolicyIndicatorType.NONE,
-      computed: 'getIndicatorType(pref.controlledBy, pref.enforcement)',
     },
   },
 
+  observers: ['prefChanged_(pref.*)'],
+
+  /** @private */
+  prefChanged_() {

[Dan Beam, 2017/01/18 01:06:34]

prefChanged_: function

[stevenjb, 2017/01/18 23:13:03]

Sigh. Sorry. Done.

+    if (!this.pref)
+      return;
+    this.indicatorType =
+        this.getIndicatorType(this.pref.controlledBy, this.pref.enforcement);
+  },
+
   /**
    * @param {CrPolicyIndicatorType} type
-   * @param {!chrome.settingsPrivate.PrefObject} pref
    * @return {string} The tooltip text for |type|.
    * @private
    */
-  getTooltip_: function(type, pref) {
-    var matches = pref && pref.value == pref.recommendedValue;
+  getTooltip_: function(type) {
+    var pref = this.pref;
+    var matches = !!pref && pref.value == pref.recommendedValue;
     return this.getPolicyIndicatorTooltip(
-        type, pref.controlledByName || '', matches);
+        type, (pref && pref.controlledByName) || '', matches);
   }
 });