Upstream service worker `postMessage` tests to WPT

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/postmessage-to-client.https.html

Index: third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/postmessage-to-client.https.html
diff --git a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/postmessage-to-client.https.html b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/postmessage-to-client.https.html
index 8eac04a63d912026cb6e5f0a1ceeb2d2eb6e90b1..15d2e889337078869e3c3e97d312649e6a8bd8b2 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/postmessage-to-client.https.html
+++ b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/postmessage-to-client.https.html
@@ -5,48 +5,50 @@
 <script src="/common/get-host-info.sub.js"></script>
 <script src="resources/test-helpers.sub.js"></script>
 <script>
-var frame;
-var t = async_test('postMessage from ServiceWorker to Client');
-t.step(function() {
+promise_test(t => {
+    var script = 'resources/postmessage-to-client-worker.js';
     var scope = 'resources/blank.html';
-    var host_info = get_host_info();
-    var sw;
-    service_worker_unregister_and_register(
-        t, 'resources/postmessage-to-client-worker.js', scope)
-      .then(function(registration) {
+    var w;
+
+    return service_worker_unregister_and_register(t, script, scope)
+      .then(registration => {
+          t.add_cleanup(() => registration.unregister());
           return wait_for_state(t, registration.installing, 'activated');
         })
-      .then(function() { return with_iframe(scope); })
-      .then(function(f) {
-          frame = f;
-          sw = frame.contentWindow.navigator.serviceWorker;
-          sw.onmessage = t.step_func(onMessage);
-          sw.controller.postMessage('ping');
-        })
-      .catch(unreached_rejection(t));
-
-    var result = [];
-    var expected = ['Sending message via clients'];
+      .then(() => with_iframe(scope))
+      .then(frame => {
+          t.add_cleanup(() => frame.remove());
 
-    function onMessage(e) {
-      assert_equals(e.constructor, frame.contentWindow.MessageEvent,
-                    'message events should use MessageEvent interface.');
-      assert_equals(e.bubbles, false, 'message events should not bubble.');
-      assert_equals(e.cancelable, false,
-                    'message events should not be cancelable.');
-      assert_equals(e.origin, host_info['HTTPS_ORIGIN'],
-                    'message event\'s origin should be set correctly.');
-      assert_equals(e.source, sw.controller, 'source should be ServiceWorker.');
-
-      var message = e.data;
-      if (message === 'quit') {
-        assert_array_equals(result, expected,
-                            'Worker should post back expected messages.');
-        frame.remove();
-        service_worker_unregister_and_done(t, scope);
-      } else {
-        result.push(message);
-      }
-    }
-  });
+          return new Promise(resolve => {
+              w = frame.contentWindow;
+              w.navigator.serviceWorker.onmessage = resolve;
+              w.navigator.serviceWorker.controller.postMessage('ping');
+            });
+        })
+      .then(e => {
+          var message = e.data;
+          assert_equals(e.constructor, w.MessageEvent,
+                        'message events should use MessageEvent interface.');
+          assert_equals(e.type, 'message', 'type should be "message".');
+          assert_equals(e.bubbles, false, 'message events should not bubble.');
+          assert_equals(e.cancelable, false,
+                        'message events should not be cancelable.');
+          assert_equals(
+              e.origin, location.origin,
+              'origin of message should be origin of Service Worker.');
+          assert_equals(e.lastEventId, '',
+                        'lastEventId should be an empty string.');
+          assert_equals(e.source.constructor, w.ServiceWorker,
+                        'source should use ServiceWorker interface.');
+          assert_equals(
+              e.source, w.navigator.serviceWorker.controller,
+              'source should be the service worker that sent the message.');
+          assert_equals(e.ports.length, 0, 'ports should be an empty array.');
+          assert_equals(message, 'Sending message via clients');
+          return new Promise(resolve => {
+              w.navigator.serviceWorker.onmessage = resolve;
+            });
+        })
+      .then(e => { assert_equals(e.data, 'quit'); });
+  }, 'postMessage from ServiceWorker to Client.');
 </script>