chromium/ui/android/java/res/drawable/list_menu_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"
    android:shape="rectangle">
    <corners android:radius="@dimen/list_menu_bg_corner_radius" />
    <solid android:color="@color/menu_bg_color" />
    <padding android:top="@dimen/list_menu_vertical_padding"
        android:bottom="@dimen/list_menu_vertical_padding" />
</shape>