diff -r 000000000000 -r 6474c204b198 dom/workers/test/fileBlob_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/fileBlob_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+/**
+ * Expects a blob. Returns an object containing the size, type.
+ */
+onmessage = function(event) {
+  var file = event.data;
+
+  var rtnObj = new Object();
+
+  rtnObj.size = file.size;
+  rtnObj.type = file.type;
+
+  postMessage(rtnObj);
+};