Merge "Animation For Fullscreen -> Freeform Transition" into udc-dev am: 5b9dc212 am: c5407f2e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22164953



Change-Id: I2f44bc83c56e6337d25562b084b741302ecb1143
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>