Save reentry fraction when animation is ignored

When the exit PiP animation is ignored due to configuraton differs, we
need to notify the PipBoundsHandler to save the reentry fraction as we
would do in animation started.

Video: http://go/recall/-/aaaaaabFQoRHlzixHdtY/fBf5A0hm0SbPxfN9kU8FZc
Bug: 157597610
Test: manually enter/exit PiP
Change-Id: I23148d3fa0290c619dba5474fa3a413786b1aa4b