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: 6c52af79 am: 25e2064b

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



Change-Id: I3d2a689d636009f2d263142d56181dbcd16a1ff7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>