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: e755dc91 am: 47df7267

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



Change-Id: I7f5dedee5bc4b22db8d6aec91994a8eaf0bae95f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>