It’s already well known that Google HQ use a custom version of Ubuntu as one of their OSes, and it seems that Google’s forthcoming Chrome Operating System will be no different – running atop a solid Debian base.
How do we know this? Take a look at the Chrome builds for Chrome OS – more specifically their file extension.
Yes, they end in the file format we all know (and love) .deb! ChromeOS -will- be debian based.