This is done by initializing the android.util.Finalizers that's
reponsible for calling out to the native bitmap destructor.
Also implemented the native bitmap destructor
Also fix Bridge by removing obsolete API methods, and removing
some unneeded synchronized blocks now that the whole rendering
(and scene creation) is protected by a synchronized on the bridge
object anyway.
Change-Id: Ie1792da6db354836542dfc11f457fe4a6d78ddfb
5a09488a15