[whatwg] New File attributes creationDate, modificationDate and size

[J Ross Nicoll]

Looking at http://www.w3.org/TR/2009/WD-FileAPI-20091117/#dfn-file

There doesn't appear to be anyway of retrieving creation date, 
modification date or size of the file. Could I suggest adding attributes 
creationDate, modificationDate and size to provide this information?

For a use case; we're working an a student coursework submission system, 
where they'll be able to drag and drop files. It would be useful to show 
the student details of the file they're uploading (for example, 
modification date is useful to confirm they're uploading the most recent 
version). We do actually see a fairly large number of mis-uploads with 
the existing upload system, and are hoping exposing more information 
during the upload (rather than once the file is received) will help.