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

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



Change-Id: I4073be15e4c42b1159b735215082bd7d1d9fbae0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>