How to hook up a shortcut key to export/download ?

[gingerbeardman]

I'm able to add a shortcut key binding, but my JS is not good enough to hook it to PngExportController's onDownloadClick_ or downloadCanvas_ functions.

My goal is easier exporting of the loaded PNG, as I do not use the Piskel format.

I have my own fork with other changes, but this one is beyond me. I can do it with a little help.

Any help, suggestions or alternative ways of thinking are appreciated!

Thanks