Update pullback start and max progress based on RecentsView scale

Instead of having defined constants that are hard to tune, now we
calculate the factors at runtime based on the launcher animation scale.
This ensures the pullback always has reasonable values regardless of
orientation, feature flags, etc.

Bug: 149934536
Change-Id: If07e3b87475f8f9613e94df00c394430aad7d507
3 files changed