Mark display parameter to be nullable am: d2969842

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



Change-Id: I5000deaa8c717033836894dc2296b05a7c6e7bfd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>