Merge "Add some assumptions to MultiDisplaySystemDecorationTests" into udc-dev am: 9f905509c7 am: 3976ef74c1

Original change: https://googleplex-android-review.googlesource.com/c/platform/cts/+/22823577

Change-Id: Ibd9d9f8d6a9cf5b704ab87ed16fabd3a15dc446d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>