Merge "Save brightness into persistent data store using a handler" into tm-dev am: bd35c8da

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17654877



Change-Id: I63e848246b07310b3a8c7db249e94ba92232b9f0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>