chrome/android/java/res/drawable/infobar_button_normal_floating.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.
-->

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:state_pressed="false"
        android:state_focused="false"
        android:drawable="@drawable/infobar_button_normal_floating_enabled" />
    <item
        android:drawable="@drawable/infobar_button_normal_floating_pressed" />
</selector>