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

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2018 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. -->

<org.chromium.ui.widget.ChromeImageButton
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    style="@style/ToolbarButton"
    android:layout_gravity="top"
    android:paddingStart="12dp"
    tools:ignore="ContentDescription"/>