PRIORITY_MIN notifications should be truly ambient.

If your notification is set to MIN priority, it will never
attempt to interrupt the user, either by an icon (already
implemented), or (new in this patch) by LED, vibration, or
sound.

Bug: 7648785
Change-Id: Ia0f8e010e62029d8d8ef1955dd20b7c79fb68398
1 file changed