This test that progress events are fired for XMLHttpRequestUpload objects in the correct order, loadstart, progress, load.

PASS: loadstart event fired on XMLHttpRequestUpload: [object XMLHttpRequestProgressEvent]
PASS: onprogress event fired on XMLHttpRequestUpload: [object XMLHttpRequestProgressEvent] [Loaded: 4 Total: 4]
PASS: load event fired on XMLHttpRequestUpload: [object XMLHttpRequestProgressEvent]