Merge "Update notification popup UI." into sc-dev am: 1bfd350ead am: 11a9b035f3 am: 83809dcd6a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15017911

Change-Id: I42ebf992f7d173be40942beb4c54f123fce98806