Mark display parameter to be nullable am: d2969842 am: a21577e5 am: b0e47910

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/18670795



Change-Id: I4dde864572f52126dee3fe9f13082fed998b685f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>