Merge "Update popup container to match spec." into sc-dev am: fed6b8cb5c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13618200

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie3763fcb6b0191aa12837d39f2215999c60ca111