Merge "Use theme color for AV container background to avoid a white flash in dark mode." into rvc-qpr-dev am: 760c7f91d5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12326450

Change-Id: Idfce2b883ceeeaaf16381f013e5b1d878dad00b0