Upstream service worker message event tests to WPT

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/ServiceWorkerGlobalScope/resources/extendable-message-event-utils.js

+var ExtendableMessageEventUtils = {};
+
+// Create a representation of a given ExtendableMessageEvent that is suitable
+// for transmission via the `postMessage` API.
+ExtendableMessageEventUtils.serialize = function(event) {
+  var ports = event.ports.map(function(port) {
+        return { constructor: { name: port.constructor.name } };
+    });
+  return {
+    constructor: {
+      name: event.constructor.name
+    },
+    origin: event.origin,
+    lastEventId: event.lastEventId,
+    source: {
+      constructor: {
+        name: event.source.constructor.name
+      },
+      url: event.source.url,
+      frameType: event.source.frameType,
+      visibilityState: event.source.visibilityState,
+      focused: event.source.focused
+    },
+    ports: ports
+  };
+};
+
+// Compare the actual and expected values of an ExtendableMessageEvent that has
+// been transformed using the `serialize` function defined in this file.
+ExtendableMessageEventUtils.assert_equals = function(actual, expected) {
+  assert_equals(
+    actual.constructor.name, expected.constructor.name, 'event constructor'
+  );
+  assert_equals(actual.origin, expected.origin, 'event `origin` property');
+  assert_equals(
+    actual.lastEventId,
+    expected.lastEventId,
+    'event `lastEventId` property'
+  );
+
+  assert_equals(
+    actual.source.constructor.name,
+    expected.source.constructor.name,
+    'event `source` property constructor'
+  );
+  assert_equals(
+    actual.source.url, expected.source.url, 'event `source` property `url`'
+  );
+  assert_equals(
+    actual.source.frameType,
+    expected.source.frameType,
+    'event `source` property `frameType`'
+  );
+  assert_equals(
+    actual.source.visibilityState,
+    expected.source.visibilityState,
+    'event `source` property `visibilityState`'
+  );
+  assert_equals(
+    actual.source.focused,
+    expected.source.focused,
+    'event `source` property `focused`'
+  );
+
+  assert_equals(
+    actual.ports.length,
+    expected.ports.length,
+    'event `ports` property length'
+  );
+
+  for (var idx = 0; idx < expected.ports.length; ++idx) {
+    assert_equals(
+      actual.ports[idx].constructor.name,
+      expected.ports[idx].constructor.name,
+      'MessagePort #' + idx + ' constructor'
+    );
+  }
+};