Thats not how Google AD Sense works, there is no need for Google to tie in to Android for AD revenue. And frankly they can afford not to do that. ADs are done be people searching from there phones and in third party Apps. Its not gonna happen.
Now MS needs all the help they can get, they are pretty desperate to make Win Phone 7 a success. Personally i think it will be released with a whimper, and die a slow death over the course of a year. Like there KIN phone did.
Android rules.