Merge "Change letterbox background default solid color" into udc-qpr-dev am:...

Merge "Change letterbox background default solid color" into udc-qpr-dev am: a7311a25 am: c35f3227

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24130224



Change-Id: Ic554b689e3c13c02649701e1db6e82c4a1dfe506
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>