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

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

+function startWorkerTest(script, type)
+{
+    var worker, messagePort;
+
+    switch (type) {
+    case 'dedicated':
+        worker = startWorker(script, false);
+        messagePort = worker;
+        break;
+    case 'shared':
+        worker = startWorker(script, true);
+        messagePort = worker.port;
+        break;
+    case 'service':
+        testFailed('Service Worker-based tests have not been implemented yet.');
+        return;
+    }
+
+    messagePort.addEventListener('message', function(event) {
+        if (event.data.length < 5 || event.data.charAt(4) == ':')
+            return;  // this is a js-test.js message.
+
+        if (!window.testRunner)
+            return;  // the test-runner is needed to provide automation.
+
+        var chunks = event.data.split('::');
+        switch (chunks[0]) {
+        case 'simulateClick':
+            testRunner.simulateWebNotificationClick(chunks[1]);
+            break;
+        }
+    });
+}