Merge "Letterboxing improvements for tabletop mode" into tm-qpr-dev am: 59326ce7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20111697



Change-Id: I4006f2c9a1a88b530a6d79f83420d268365b6fa5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>