Chromium

Chrome Version : 24.0.1312.57
URLs (if applicable) :
Other browsers tested:
Firefox 18.0.1: OK

What steps will reproduce the problem?

1. Execute the following snippet from a regular Javascript file:
   var xhr = new XMLHttpRequest();
   xhr.open('POST', "www.example.com/upload/", true);
   xhr.onprogress = function(e) {
   // Do stuff
   };

xhr.upload.onprogress = function(e) {
// Never called when executed from a worker.
};

xhr.onload = function(e) {
// Do stuff
};

xhr.send(data);

The upload progress will be displayed.
2. Load the same snippet in a web worker, the progress callback will never be invoked.

What is the expected result?
To get upload progress on your current file upload.

What happens instead?
No progress is displayed.