chromium/chrome/browser/ui/android/google_bottom_bar/java/res/drawable/bottom_bar_searchbox_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2024 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">

    <size
        android:height="@dimen/google_bottom_bar_searchbox_container_height" />

    <solid
        android:color="@color/google_bottom_bar_searchbox_background_color" >
    </solid>

    <corners
        android:radius="@dimen/google_bottom_bar_searchbox_radius">
    </corners>

</shape>