Merge "Improve enter and dismiss transition by using snapshot" into udc-dev am: 472c42cc am: 3cdc9439 am: 5946f92f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23258461



Change-Id: I1081525e827d98cdcccfa83097a830fe46377813
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>