[automerger skipped] Merge "Remove uses of background color attribute" into sc-qpr1-dev am: d0561dca -s ours am: b5a1c65a -s ours

am skip reason: Merged-In Iee395289ecd108327fa2acc23d19059b50f52822 with SHA-1 e11ecf0c is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15897415

Change-Id: Id1878f59a0a7ab4b91726cadb99d8e059329cd1f