import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/xhr/tests/terminateSyncXHR_worker.js

@@ -0,0 +1,19 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+onmessage = function(event) {
+  throw "No messages should reach me!";
+}
+
+var xhr = new XMLHttpRequest();
+xhr.open("GET", "worker_testXHR.txt", false);
+xhr.addEventListener("loadstart", function ()
+{
+  // Tell the parent to terminate us.
+  postMessage("TERMINATE");
+  // And wait for it to do so.
+  while(1) { true; }
+});
+xhr.send(null);