Merge "Return copies of private array members in Display.java to protect them...

Merge "Return copies of private array members in Display.java to protect them from being modified from the outside." into udc-dev am: 037b13c9 am: 6c5a8c31

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22648883



Change-Id: I97feb204767ec214225d0c03b415d8fdf0e5b11a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>