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

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

<!-- Copyright 2014 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.
-->

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/app_banner_card_highlight" />
    <item android:drawable="@android:color/transparent" />
</selector>