Bug 1134224 - More test for test_bug1132395.html, r=ehsan

dom/workers/test/bug1132395_sharedWorker.js

@@ -1,7 +1,12 @@
+dump("SW created\n");
 onconnect = function(evt) {
+  dump("SW onconnect\n");
   evt.ports[0].onmessage = function(e) {
+    dump("SW onmessage\n");
     var blob = new Blob(['123'], { type: 'text/plain' });
+    dump("SW blob created\n");
     var url = URL.createObjectURL(blob);
+    dump("SW url created: " + url + "\n");
     evt.ports[0].postMessage('alive \\o/');
   };
 }

dom/workers/test/test_bug1132395.html

@@ -13,13 +13,20 @@
 
 <script class="testbody" type="text/javascript">
 
+// This test is full of dummy debug messages. This is because I need to follow
+// an hard-to-reproduce timeout failure.
+
+info("test started");
 SpecialPowers.pushPrefEnv({ set: [["dom.workers.sharedWorkers.enabled", true]] }, function() {
+  info("test started");
   var sw = new SharedWorker('bug1132395_sharedWorker.js');
   sw.port.onmessage = function(event) {
+    info("sw.onmessage received");
     ok(true, "We didn't crash.");
     SimpleTest.finish();
   }
 
+  info("sw.postmessage called");
   sw.port.postMessage('go');
 });