Fix issue with animation handler deadlock

- Stop synchronously fetching the choreographer on the animation thread as
  the animation thread may be processing an update with the WM lock already
  held
- Revert to using AnimationThread

Bug: 120844232
Test: Manual
Change-Id: Ia9cc3d2e0e2bf8740f2725fe59d12a31a67b1b89
2 files changed