Merge "Sync notification-shell definition with Chrome" into rvc-dev am: 480af73cc9 am: 3d2cc1e9c8

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/wayland-protocols/+/12265008

Change-Id: Ie0b30710fc43be276fedb0a0d88610218359e07e