Allow reentry bounds to be overriden before saving

Allows subclasses to use something other than the
normal bounds as the reentry bounds when re-entering
PIP mode.

Bug: 160799929
Test: atest SystemUITests
Change-Id: I050403ca3a5c2dc44c04cca741ac71bdc4f12b8a
Merged-In: I050403ca3a5c2dc44c04cca741ac71bdc4f12b8a
(cherry picked from commit 5679a841b75cb69e5e57da20ab1c91b5963fb280)
1 file changed