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: 9ad8b30c am: 550c4752 am: 7af288c1

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



Change-Id: Idc2b6d1eebfac0f641fe9b291b6b418f3dd86282
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>