ServiceWorker: Add LayoutTest for WindowClient.navigate().

LayoutTests/http/tests/serviceworker/chromium/resources/sw-test-helpers.js

 // Test helper that is meant as a mini test framework to be used from a service
 // worker that runs some tests and send results back to its client.
 //
 // A simple usage of this framework would consist of calling initialize() to
 // setup then runNextTestOrQuit() in order to start running the methods defined
 // by TESTS. Then, tests can start sending messages back to the client using
 // postMessage().
 //
 // Example:
 // var TESTS = [
@@ skipping 21 matching lines @@
 }
 
 self.postMessage = function(msg) {
     client.postMessage(msg);
 }
 
 // Run the next test in TESTS if any. Otherwise sends a 'quit' message. and
 // stops.
 // In order for that call to succeed, the script MUST have a TESTS array
 // defined.
-self.runNextTestOrQuit = function() {
+self.runNextTestOrQuit = function(data) {
     ++currentTest;
     if (currentTest >= TESTS.length) {
         client.postMessage('quit');
         return;
     }
-    TESTS[currentTest]();
+    TESTS[currentTest](data);
 }
 
 // This method will use the |client| in order to synthesize a notificationclick
 // event. The client will then use the testRunner.
 // The returned promise will be resolved with the notificationclick event
 // object.
 self.synthesizeNotificationClick = function() {
     var promise = new Promise(function(resolve) {
         var title = "fake notification";
         registration.showNotification(title).then(function() {
             client.postMessage({type: 'click', title: title});
         });
 
         var handler = function(e) {
             resolve(e);
             e.notification.close();
             self.removeEventListener('notificationclick', handler);
         };
 
         self.addEventListener('notificationclick', handler);
     });
 
     return promise;
 }