Not a full environment; just enough of one for average web development (meaning vim/emacs, git, ruby/nodejs/etc, NaCl compiler, and associated debuggers), a small enough set to be vetted by Google and run at low privilege while still letting an average developer get started out of the box w/o needing to figure out hosting or such right away.

Hell, just adding some project management to the inspector to act as a psuedo-IDE for Chrome apps would be a start. I've got personal attachment to *nix from using so much of it, some 12-year old that stumbled into the devtools has no such attachment.