Merge "Add a config to control split-screen task dimming" into tm-dev am:...

Merge "Add a config to control split-screen task dimming" into tm-dev am: b15f154c am: e6358030 am: 8301c459

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18281607



Change-Id: I53a0dd9c3156c98daefa46fd2135715b09dd77dd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>