chrome/android/java/res/drawable/infobar_info_background.xml

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

<!-- Copyright 2013 The Chromium Authors. All rights reserved.

     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">
    <gradient
        android:startColor="#fffbfbfb"
        android:endColor="#fff2f2f2"
        android:angle="270" />
</shape>