import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/workers/test/bug1063538_worker.js

@@ -0,0 +1,25 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+var gJar = "jar:http://example.org/tests/dom/base/test/file_bug945152.jar!/data_big.txt";
+var xhr = new XMLHttpRequest({mozAnon: true, mozSystem: true});
+var progressFired = false;
+
+xhr.onloadend = function(e) {
+  postMessage({type: 'finish', progressFired: progressFired });
+  self.close();
+};
+
+xhr.onprogress = function(e) {
+  if (e.loaded > 0) {
+    progressFired = true;
+    xhr.abort();
+  }
+};
+
+onmessage = function(e) {
+  xhr.open("GET", gJar, true);
+  xhr.send();
+}