Merge "Allow shell to control transition animations" into udc-dev am: dca0a91a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24126330



Change-Id: I40cb6d2956895392d3b35969241d94b4ec85867a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>