Merge "PiP Transition: Only allow TRANSIT_PIP and TRANSIT_OPEN types for enter animation." into sc-v2-dev am: 4c06d013b5 am: e92a883d27

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15484574

Change-Id: I6e2edc13227f0ab93aa34298d50d02c93514cf06