Mark display parameter to be nullable am: d29698422c am: e7d413d6e2 am: fe3bd77a77 am: 3ca85bdd83

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

Change-Id: Iea8b028d5ffbbec771cb77bcd622360889811003
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>