Prioritize system toasts am: 939612739c am: 6c15eac41d

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

Change-Id: I6e5aa30d5fc8454c9e90ccaf2b704948741a486f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>