Merge "Prioritize system toasts" into sc-dev am: 687bb9a4 am: 6bb44493

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25102282



Change-Id: I94a10a4d430678c64c7a02f4393ce9341945983f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>