Merge "Conform the logic to decide wallpaper darkness" into udc-dev am: 4f7f216c1f am: 5113509114 am: 388b2b91a2 am: 35c0cb358e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/23618530

Change-Id: Ibe3413e5be7cef7ec1807adb7b4be80ec5b8c936
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>