chromium/components/infobars/android/res/drawable/infobar_wrapper_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2015 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
        <bitmap
            android:src="@drawable/infobar_shadow_top"
            android:gravity="top|fill_horizontal"
            android:tileMode="disabled" />
    </item>
    <!-- Java code reaches into the containing LayerDrawable and then this
         ColorDrawable using the id below. Be careful changing this layout
         without adjusting the code making these assumptions. -->
    <item
        android:id="@+id/infobar_wrapper_bg_fill"
        android:top="@dimen/infobar_shadow_height"
        android:drawable="@color/infobar_background_color" />
</layer-list>