Merge "Merge "Revert "Allow bar to be transparent if letterbox contains bar""...

Merge "Merge "Revert "Allow bar to be transparent if letterbox contains bar"" into rvc-dev am: 64682e76 am: 6ddc9881 am: 28c6db6b" into rvc-qpr-dev-plus-aosp am: 06c176fd

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12128053

Change-Id: I439f644b4c211721ec22b1275d949f910a4f484b