chromium/components/browser_ui/widget/android/java/res/layout/automotive_layout_with_vertical_back_button_toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2023 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/automotive_base_linear_layout"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/back_button_toolbar"
        android:layout_width="?attr/actionBarSize"
        android:layout_height="match_parent"
        android:background="@android:color/black"
        app:theme="@style/DarkModeActionBarTheme"
        app:navigationIcon="@drawable/ic_arrow_back_24dp"
        app:navigationContentDescription="@string/back"/>

    <ViewStub
        android:id="@+id/original_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>