API to allow some classloader control over instantiation of
items from application's manifest. Unlike the first attempt
this does not encourage developers to extend Application, it simply
provides a small surface to allow control over the creation of objects
like Activities, Services, Receivers, and Providers.
Test: manual
Bug: 70623879
Change-Id: Idcab7c60f54ce3f4575ac29dcdcae321cf458bf3
a80bfb5d55