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: I446a6ff863768c1877ca45acbe763db654548e87
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>