chromium/chrome/android/webapk/shell_apk/res/layout-night-v31/splash_screen_view.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.
-->

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/dark_background_color_non_empty">

  <ImageView
      android:id="@+id/splashscreen_icon_view"
      android:layout_width="@dimen/oom_splash_icon_size"
      android:layout_height="@dimen/oom_splash_icon_size"
      android:layout_gravity="center"
      android:src="@drawable/splash_icon"/>

</FrameLayout>