Merge "Save brightness into persistent data store using a handler" into tm-dev...

Merge "Save brightness into persistent data store using a handler" into tm-dev am: bd35c8da am: e39e9e50

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



Change-Id: Id971660f97872c019b565dfd9c8a3b34cbf68636
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>