Merge "Make letterbox education dialog react to dark/light themes" into...

Merge "Make letterbox education dialog react to dark/light themes" into udc-dev am: 89106926 am: 21b3e879

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22930896



Change-Id: Ie90397508b39132ca641416c4dbb763bd8552da2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>