Merge "Animation for Freeform -> Fullscreen Transition" into udc-dev am: db513368 am: 0df5d1e3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22210482



Change-Id: I9a95afee62d4c4062359999383540a8c8b872d9b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>