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 am: 7de0ae35 am: 29a40af7

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



Change-Id: Iad0bf696936b29a7236dbad34590dfc22cb3c5a5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>