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: 5a0fd1b2

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



Change-Id: Id547be00574396993ebcb96bc31aed0e2a547c8f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>