chromium/components/permissions/android/res/drawable/permission_icon_background.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.
-->
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:tint="?attr/colorPrimaryContainer"
    android:shape="rectangle">
    <corners android:radius="20dp"/>
</shape>