Merge "Add dark theme bg for transient taskbar." into tm-qpr-dev am: 1d253ac8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20413620



Change-Id: I38ae0f159eab975c65a0044cb54c0aed419d72f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>