Merge "PiP: Allow customization of PiP minimum size." into sc-dev am: c312c648 am: 09755b54 am: 0c9114c8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14077517

Change-Id: I3ed504584a81254b9f3f6b736374bd739e6ee4ed