Making transition out of recents look better

- Fading out recents first, then scaling up app
thumbnail
- Fade Recents out over 130ms
- Delay the window animation for 200ms first,
then animate for 200ms (previously we didn't delay
and then animated for 300ms)

Bug: 6390075

Change-Id: Ia8c753bf7ee03d2acef6eb2772b28d88fe10a682