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: I0faf460f74b667019880f41aad3c56d94fa119e5