chromium/chrome/android/webapk/shell_apk/res/drawable-xxhdpi/splash_icon.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2018 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@mipmap/splash_icon_xxhdpi"/>