Google tried that and ended up on the wrong end of a patent lawsuit. The Java community is just going to keep using OpenJDK like they do now. As evil as Snoracle is being, it's mostly a theoretical problem given that so few people use Harmony.
I don't think it has much to do with Android, for two reasons. Google doesn't care whether Harmony gets TCK-certified or not, and the Apache-Sun spat dates from early 2007, before Android was even announced. http://en.wikipedia.org/wiki/Apache_Harmony#Difficulties_to_...