chromium/chrome/browser/ui/android/pdf/java/res/layout/pdf_page.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2024 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:focusable="true"
    android:focusableInTouchMode="true">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/pdf_fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>