Prioritize system toasts am: 939612739c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25097585

Change-Id: I8edd658df1a979e944ead868b28c9a5896634f3e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>