Merge "Listen for density changes through DisplayController callbacks" into tm-dev am: 37ce4410

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



Change-Id: Ifae010e54cfd36b270c65d5aec7b1d70634f10db
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>