Mark display parameter to be nullable am: d29698422c am: a21577e507 am: b0e479100d

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>