Merge "[1/n] Move Letterbox education dialog classes" into tm-qpr-dev am:...

Merge "[1/n] Move Letterbox education dialog classes" into tm-qpr-dev am: 812e3291 am: 04378e03 am: 92a72a71 am: 0690dee5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21911723



Change-Id: Ied827b0ad15470f3b43e01517feabee88cdfd5c5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>