I think your asking alot. Google would have to have something major to gain from such an venture. Where do they fit in when it comes to Reactos, and making money (to things which seriously dont belong together)? When you look for a sponser, consider that their (err) probably not conserned with the future of ReactOS. I think Dell, or for that matter, any pc manufacturer would be the best idea, but thats just my opinion.
brian