Looks like I might be able to achieve this with the a:jsFunction component.  
That lets me call into the whole JSF framework from a plain JS function.  I can 
get a JS function to trigger when the file upload field is changed.  And that 
could then trigger something with a:jsFunction.

I did try to use a <a:commandButton> to do a partial-rerender when submitting a 
file upload, and that did not work.  Somehow the backing bean method was 
getting called without any form data being submitted.  I don't get it.

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