Merge "Listen for density changes through DisplayController callbacks" into tm-dev am: 37ce441089 am: a299f92e33

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17529040

Change-Id: Ib565537e4bd1dc0c268794da2a59fe7f23b127b4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>