Ensure that task org updates all happen off the main thread

- Move the animator to be called on the update thread
- Move the calls on task org to update on that thread as well
- Cache the leash and token to ensure we don't make binder calls to fetch
  the leash on each frame of the animation
- Don't align with SF vsync now that we're driving the surface animations

Bug: 150810666
Test: Enter PIP, move it around
Test: atest PipAnimationControllerTest
Change-Id: Id05980529681f892638f52f492262fde246cac20