Merge "Move transition utility functions into shell.util" into udc-dev am:...

Merge "Move transition utility functions into shell.util" into udc-dev am: d3d32373 am: f05c482a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21529517



Change-Id: Ibcf95abf0f4047c0c95d96cf7fe844563be4629a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>