Merge "Allow users to dismiss notifications in popup view." into sc-qpr1-dev am: 2f9f6378be

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15690344

Change-Id: Ic13a38f8e5ea7c250b476f0e0751de7898ca4d84