src/third_party/skia/platform_tools/android/apps/arcore/src/main/res/menu/title.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/action_left"
        android:icon="@android:drawable/ic_media_previous"
        android:showAsAction="always"/>

    <item android:id="@+id/action_right"
        android:icon="@android:drawable/ic_media_next"
        android:showAsAction="always"/>

</menu>