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: I86e7cb80830f859c6a6659a12d884722ca435d5f