Merge "Exclude a private display from...

Merge "Exclude a private display from getDisplayIdsForStartingVisibleBackgroundUsers" into udc-qpr-dev am: c6308f4d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23493421



Change-Id: Ie20d2be72a154e140fbebfe4e6825f1a45f86297
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>