That depends...just my 2 cents. If the chrome bore looks virtually flawless, don't bother. You can use 1000 grit sandpaper, oil it up well with some 2 stroke (or plain ol' 30 weight) oil, and LIGHTLY touch up any small, scratched or scuffed up areas. Any imperfections that will catch a fingernail may require re-chroming of the cylinder.
You don't want to try and "cross hatch" the cylinder, like you would with a traditional steel bore, but a little touch up of some less than perfect spots won't hurt.
Probably the best thing is to use a flex-hone (with the little balls)
to run up and down a FEW times (well oiled) through the cylinder, but you have to have the correct size to fit the cylinder. They aren't terribly expensive...but kind of a luxury.
Use your judgement...a little touch up with the fine sandpaper doesn't hurt...just remember your not trying to cross hatch or remove any of the chrome.
Clean the cylinder spotlessly when you're done before you install new piston, and have at it.