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: c450887b am: eb5f2d3c am: 42fd0879

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



Change-Id: I5c339bc230bc25f71bdda706389ae46d1a9e9d7a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>