Set currentTarget on progress events

Set the event target for the progress event via the constructor, for
consistency with other events. Also ensures currentTarget is set at the
same time.

Author: Andy Stanford-Bluntish

fake_xml_http_request.js

@@ -192,8 +192,7 @@
       Triggers an `onprogress` event with the given parameters.
     */
     _progress: function _progress(lengthComputable, loaded, total) {
-      var event = new _Event('progress');
-      event.target = this;
+      var event = new _Event("progress", false, false, this);
       event.lengthComputable = lengthComputable;
       event.loaded = loaded;
       event.total = total;

src/fake-xml-http-request.js

@@ -186,8 +186,7 @@ EventedObject.prototype = {
     Triggers an `onprogress` event with the given parameters.
   */
   _progress: function _progress(lengthComputable, loaded, total) {
-    var event = new _Event('progress');
-    event.target = this;
+    var event = new _Event("progress", false, false, this);
     event.lengthComputable = lengthComputable;
     event.loaded = loaded;
     event.total = total;

test/upload_test.js

@@ -22,4 +22,7 @@ test("_progress triggers the onprogress event", function() {
   ok(event.lengthComputable, "ProgressEvent.lengthComputable");
   equal(event.loaded, 10, "ProgressEvent.loaded");
   equal(event.total, 100, "ProgressEvent.total");
+  strictEqual(event.target, upload, "ProgressEvent.target is the upload object");
+  strictEqual(event.target, event.currentTarget,
+    "ProgressEvent.target matches ProgressEvent.currentTarget");
 });