Merge "PiP: Allow customization of PiP minimum size." into sc-dev am: c312c6481b am: d87deceb6e

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

Change-Id: Ia578db3b102826c6d41eeb69d056995eb7312b7e