Expose URLUtilsReadOnly.origin

LayoutTests/fast/workers/resources/worker-location.js

 function log(message)
 {
     document.getElementById("result").innerHTML += message + "<br>";
 }
 
 function gc()
 {
     if (window.GCController)
         return GCController.collect();
 
     for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
         var s = new String("abc");
     }
 }
 
 if (window.testRunner) {
     testRunner.dumpAsText();
     testRunner.waitUntilDone();
 }
 
 var worker = createWorker();
 worker.postMessage("eval WorkerLocation");
 worker.postMessage("eval typeof location");
 worker.postMessage("eval location");
 worker.postMessage("eval location.href");
+worker.postMessage("eval location.origin");
 worker.postMessage("eval location.protocol");
 worker.postMessage("eval location.host");
 worker.postMessage("eval location.hostname");
 worker.postMessage("eval location.port");
 worker.postMessage("eval location.pathname");
 worker.postMessage("eval location.search");
 worker.postMessage("eval location.hash");
 worker.postMessage("eval foo//bar");
 
 worker.onmessage = function(evt) {
     if (!/foo\/\/bar/.test(evt.data))
         log(evt.data.replace(new RegExp("/.*LayoutTests"), "<...>"));
     else {
         log("DONE");
         if (window.testRunner)
             testRunner.notifyDone();
     }
 }