Mark display parameter to be nullable am: d29698422c am: a21577e507 am: 92870f6e88

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

Change-Id: Icaa2f875108ecbda0ced3f032c6f9d4fb3d20261
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>