Trigger chrome.storage.onChanged events for policy updates on the 'managed' namespace.

chrome/test/data/extensions/api_test/settings/managed_storage/background.js

 // Copyright (c) 2012 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.
 
 chrome.test.runTests([
   function getPolicy() {
     chrome.storage.managed.get(
         'string-policy',
         chrome.test.callbackPass(function(results) {
           chrome.test.assertEq({
             'string-policy': 'value'
           }, results);
         }));
   },
 
   function getListOfPolicies() {
     chrome.storage.managed.get(
         ['string-policy', 'int-policy', 'no-such-thing'],
         chrome.test.callbackPass(function(results) {
           chrome.test.assertEq({
             'string-policy': 'value',
             'int-policy': -123,
           }, results);
         }));
   },
 
   function getAllPolicies() {
     chrome.storage.managed.get(
-        null,
         chrome.test.callbackPass(function(results) {
           chrome.test.assertEq({
             'string-policy': 'value',
             'int-policy': -123,
             'double-policy': 456e7,
             'boolean-policy': true,
             'list-policy': [ 'one', 'two', 'three' ],
             'dict-policy': {
               'list': [ { 'one': 1, 'two': 2 }, { 'three': 3} ]
             }
           }, results);
         }));
   },
 
   function getBytesInUse() {
     chrome.storage.managed.getBytesInUse(
-        null,
         chrome.test.callbackPass(function(bytes) {
           chrome.test.assertEq(0, bytes);
         }));
   },
 
   function writingFails() {
     var kReadOnlyError = 'This is a read-only store.';
     chrome.storage.managed.clear(chrome.test.callbackFail(kReadOnlyError));
     chrome.storage.managed.remove(
         'string-policy',
         chrome.test.callbackFail(kReadOnlyError));
     chrome.storage.managed.set({
       'key': 'value'
     }, chrome.test.callbackFail(kReadOnlyError));
   }
 ]);