Prioritize system toasts am: 939612739c

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

Change-Id: I785cb54e6c7b446ef2f15575f4cc6ffbc84426e2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>