This new ability can be obtained after Google rolled out a Dev Channel software update for the Samsung Series 5 and Google Cr-48 notebooks a couple of days ago. The update will also officially fix a problem with Pandora Internet radio, make sure Pepper Flash is updated, while fixing a bug which had prevented pop-up windows from being restored in the prim and proper manner.
Before taking advantage of the Dev Channel, you will need to use it first, opening a terminal and entering the right command to enable experimental_storage. Bear in mind that ZIP support is still a diamond in the rough, and is not quite ready for public consumption – yet. That day will come though.