The goal for this change is to get the timing for animation update. Since
AnimatorSet does not support update listeners, we have to go with the a different
approach, which sets up a value animator that runs between the start and end of
the AnimatorSet. We can then get the animation update timing from the ValueAnimator.
Bug: 26329675
Change-Id: Ibe7fce81eb6da5e05c87a732c1d3bc904b4e5e6f
(cherry picked from commit I378a0964da8f7090f65f6b56275a302e30668835)