Initial support for ContentObservers in ContentResolver.  Only one ContentObserver at a time is supported for a given resolver URI in this implementation.
Implement unit tests for content observer support in ShadowContentResolver and ShadowContentObserver
Implement Animator#start, ValueAnimator#ofInt(), and AsyncTask#executOnExecutor()
Robo upstream merge
Merge pull request #398 from zoodles/master

Pull request from Zoodles team