Mark display parameter to be nullable am: d29698422c

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

Change-Id: If47758a2b669a24d74a430fada9599a059f1c27b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>