chrome/android/java/res/drawable/infobar_button_text.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_enabled="true"
        android:color="#ff000000" />
    <item
        android:state_enabled="false"
        android:color="#77000000" />
</selector>