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

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



Change-Id: I999802370205c9102d70e9da84b3ce5d6fb9683f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>