quickstep/res/drawable/gesture_tutorial_finger_dot.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="?android:attr/colorAccent" />
    <size android:width="92dp" android:height="92dp"/>
</shape>