There are two types of chrome plating.
Decorative chrome plating is for looks and can be done on a variety of materials. It generally involves applying a layer of nickel first. It generally won't stand up to a lot of heavy wear.
Chrome plating for durability under hard wear conditions and for corrosion resistance is called hard chrome or industrial chrome plating. I doubt that plastics can be hard chrome plated.
Formerly known as fiddletown