Merge "Handle animating exit windows with shell transition" into udc-dev am:...

Merge "Handle animating exit windows with shell transition" into udc-dev am: 203679cd am: 944ec1e2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21493087



Change-Id: I54fa68050fe394d89f4ba863597f8c421df9bfd6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>