ServiceWorker: Add LayoutTest for WindowClient.navigate().

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

Index: LayoutTests/http/tests/serviceworker/chromium/resources/sw-test-helpers.js
diff --git a/LayoutTests/http/tests/serviceworker/chromium/resources/sw-test-helpers.js b/LayoutTests/http/tests/serviceworker/chromium/resources/sw-test-helpers.js
index 3f81a544f3f02181e3d460f994b63af897902da1..4b708ecff874f99f53f39b30fedf9be4561680a3 100644
--- a/LayoutTests/http/tests/serviceworker/chromium/resources/sw-test-helpers.js
+++ b/LayoutTests/http/tests/serviceworker/chromium/resources/sw-test-helpers.js
@@ -39,13 +39,13 @@ self.postMessage = function(msg) {
 // 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