Merge "Add widget description to WidgetCell" into sc-dev am: 13d5079e90

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13731966

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Idf5d7a6df5115c403904c79c983c491f07f49c64