Merge "PiP: Allow customization of PiP minimum size." into sc-dev am: c312c6481b am: 9b550d2c36 am: 1626a96b58

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

Change-Id: Ief36a2b021745b55843551fadd187eb83c56ef66