packages/SystemUI/res/drawable/scorecard_gameover.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle"
    >
    <corners
        android:radius="8dp" />
    <solid
        android:color="#ffff0000" />
</shape>