Merge "Polish enter PiP animation on back pressed" into tm-qpr-dev am: 955ef184 am: 1a722700

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19086852



Change-Id: Ie82d7d1f6384d3925cec040b3ced8003a7e8a5b2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>