chrome/android/java/res/layout/reader_mode_text_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2015 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. -->

<!-- Reader Mode bar text -->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/reader_mode_text_view"
    style="@style/ContextualSearchTextViewLayout" >
    <TextView
        android:id="@+id/reader_mode_text"
        android:text="@string/reader_view_text"
        style="@style/ContextualSearchTextView"
        android:layout_width="match_parent"
        android:layout_gravity="bottom"
        android:background="#FFF"
        android:layout_marginStart="7dp"
        android:layout_marginEnd="7dp" />
</FrameLayout>