chromium/components/browser_ui/styles/android/java/res/drawable/toolbar_hairline.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.
-->

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@macro/divider_line_bg_color"/>
    <size android:height="@dimen/toolbar_hairline_height"/>
</shape>