Merge "Use the splash screen background color as the fallback background color" into sc-dev am: 3616f29f83 am: b0c79d4c28 am: 9c9e9f8d2b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14881306

Change-Id: I12ca950e65ce90383181aec6bb0390d7e72dcad5