[Media TTT] Animate the chip in.

This includes updating ViewHierarchyAnimator to also handle fading in
during #animateAddition (if requested).

Bug: 203800644
Test: manual: See fast + slow animations of the chip attached to the
bug.
Test: ViewHierarchyAnimatorTest

Change-Id: Iedf29695b187eaeddc8734d326ecf08a0ad63dcb
7 files changed