Merge "PiP: Allow customization of PiP minimum size." into sc-dev am: c312c6481b am: 9b550d2c36

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

Change-Id: I03bd0ddb2472c66a59a43ec1c316405940bba524