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

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



Change-Id: I06ceb1319a48c8613795ea4b15555cce62402a54
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>