In 2008 I proposed doing this too Google and a Govt agency. Both thought it was a bad idea. Shortly after Department 13 made a security enhanced version of Android that latter was funded by DARPA. Then the NSA built SE Android in line with my proposal from a few years before. Now Google is doing what I suggested to them in 2008. Hey it only took them five years.
“Google strengthens Android security muscle with SELinux protection” http://feedly.com/k/14J4T54