[WIP] Move Web Notifications to a WebFrame-less code path (Blink).

LayoutTests/fast/notifications/resources/notification-worker.js

+var port = self;
+
+function isDedicatedWorker()
+{
+    return !!self.postMessage;
+}
+
+self.addEventListener('connect', function(event)
+{
+    port = event.ports[0];
+    runTest();
+});
+
+var testRunner = {
+    simulateWebNotificationClick: function(title)
+    {
+        if (port)
+            port.postMessage('simulateClick::' + title);
+    }
+};
+
+if (isDedicatedWorker())
+    runTest();