Add layout test for reply property of notificationclick event

third_party/WebKit/LayoutTests/http/tests/notifications/instrumentation-service-worker.js

 // Deep-copies the attributes of |notification|. Note that the
 // robustness of this function (and also |assert_object_equals| in
 // testharness.js) affects the types of possible testing can be done.
 // TODO(peter): change this to a structured clone algorithm.
 function cloneNotification(notification) {
     function deepCopy(src) {
         if (typeof src !== 'object' || src === null)
             return src;
         var dst = Array.isArray(src) ? [] : {};
         for (var property in src) {
@@ skipping 94 matching lines @@
     if (event.notification.body.indexOf('ACTION:CLOSE') != -1)
         event.notification.close();
 
     // Notifications containing "ACTION:OPENWINDOW" in their message will attempt
     // to open a new window for an example URL.
     if (event.notification.body.indexOf('ACTION:OPENWINDOW') != -1)
         event.waitUntil(clients.openWindow('https://example.com/'));
 
     messagePort.postMessage({ command: 'click',
                               notification: notificationCopy,
-                              action: event.action });
+                              action: event.action,
+                              reply: event.reply });
 });
 
 addEventListener('notificationclose', event => {
     var notificationCopy = cloneNotification(event.notification);
     messagePort.postMessage({ command: 'close',
                               notification: notificationCopy });
 });
 
 addEventListener('fetch', event => {
     fetchHistory.push(event.request.url);
     event.respondWith(fetch(event.request));
 });