Implement clip modes during animation

Introduce modes how surfaces are clipped to the stack bounds
during transitions.

Use setFinalCrop to implement STACK_CLIP_AFTER_ANIM.

Add logic to determine which stack clip mode to use.

Bug: 26559810
Change-Id: I8edc47de3aaf1ef12055cefd8ceb8df536c5109a
6 files changed