Allow ViewHierarchyAnimator to exclude child views from animations.

This has been a long requested feature and b/283456173 provided the
right opportunity to implement it. I have tested it within the privacy
dialog and the behavior is as expected.

Bug: 283456173
Test: unit tests included
Change-Id: I9b97e2e7aaff603174cabd4328f17ec1884816ee
2 files changed