ui/android/java/res/drawable/menu_bg_baseline.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2021 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<nine-patch xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/popup_bg"
    android:tint="@color/menu_item_bg_color"
    android:tintMode="multiply"/>