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 am: 3a458998

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



Change-Id: I5878176777167492133bd0a0c6eea9685c7f001b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>