Merge "Prioritize system toasts" into tm-dev am: fe7069660e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25102281

Change-Id: I0fb57079c7ac7ddbff8ff14abb0bb2aed04096a1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>