chromium/components/browser_ui/widget/android/java/res/drawable-v23/modern_toolbar_text_box_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2017 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="@color/toolbar_text_box_background" />
    <size
        android:width="@dimen/modern_toolbar_background_size"
        android:height="@dimen/modern_toolbar_background_size" />
    <corners android:radius="@dimen/modern_toolbar_background_corner_radius" />
</shape>