Add fallback animation for auto-enter without source rect hint

- Launcher will create a new surface which is faded in over the app,
  and as it finishes the recents animation, we transfer the overlay
  from the leash to the task (as with the transform), and when the
  pip task organizer receives it, it can fade out and remove the
  surface
- Fixes flash of status bar colors when going from light status bar
  to home (dark status bar) by deferring whether a task affects the
  sysui flag until it enters pip (only for autoenter)

https://recall.googleplex.com/projects/e3f080d7-2818-43f0-a087-405000b8fdf5/sessions/971a84c8-a622-4b34-a9de-4e595595da42

Bug: 184703546
Test: Swipe up from app with auto-enter but no source hint rect

Change-Id: I0a00cdb98d0a599ef065206e0cd2cfc0e6cc72b1