chromium/chrome/browser/readaloud/android/java/res/drawable/rounded_ripple.xml

<?xml version="1.0" encoding="UTF-8"?> 
<!--
Copyright 2023 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:attr/colorControlHighlight">
    <item android:id="@android:id/mask">
        <shape android:shape="rectangle">
            <solid android:color="@android:color/black" />
            <corners android:radius="50dp" />
        </shape>
    </item>
</ripple>