chromium/android_webview/tools/system_webview_shell/apk/res/xml/ad_services_config.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.
-->

<ad-services-config>
    <attribution allowAllToAccess="true" />
</ad-services-config>