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

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



Change-Id: I2afb92ffd854929e6f97ccbb917e4aaae6fd4d04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>