It's super critical to call nStart

Bug: 18204974

Even if we are canceling or ending an animation
nStart() *must* be called, otherwise the native-side listener
is not attached (lazy-attached for JNI cyclic reference reasons),
and then Animator::callOnFinishedListener() no-ops as there's
no listener set

Add a lifecycle verifier to ensure that nStart is always
called on animators that are attached and get finished

Change-Id: Ibc345b5be97b6d3f95a11c361ebe020d030fd3b6