Merge "Restrict change mode to apply transition background" into udc-dev am:...

Merge "Restrict change mode to apply transition background" into udc-dev am: ad693c12 am: 3bc1119f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23061056



Change-Id: I1c6af598b529d3a4f6a6139b4d27bb69f51db107
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>