Merge "Added debug menu option for testing secondary display." into tm-qpr-dev am: 06b1d8c1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/19701174



Change-Id: I3b478199572cee3b7a0e71623ab83eee58f47eef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>