Merge "Remove light theme support for split screen surface." into udc-dev am:...

Merge "Remove light theme support for split screen surface." into udc-dev am: 9779b22c am: 7d55b463 am: a46b3305

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22955244



Change-Id: I8e92636d692a6c04805b54a96cd5db167b9e6d1e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>