Merge "Animate taskbar background alpha and visibility alpha" into sc-dev am: 6d46fff269

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13438959

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ifa62a5282e2c4d6bdfb5a2c6f3480f0fbbc8ebf9