Why can't I have an Android/Chrome OS hybrid?

Maybe I'm missing something (I doubt it) but why is it that there are windows/android tablet/netbook combos, but no tablet/netbook combo or just netbook that has Android/Chrome? I mean, all joking aside, that would be the perfect combination, and I can't grasp why it hasn't happened yet, unless Google won't allow it. All I can think is that there's something keeping them from mixing chrome os with other os's, and if that's the case, wtf mate?