WordPress/src/main/res/layout/webview.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/webview_wrapper"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <include
        layout="@layout/toolbar"
        android:id="@+id/toolbar" />

    <WebView
        android:id="@+id/webView"
        android:layout_below="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ProgressBar
        android:id="@+id/progress_bar"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="@dimen/progress_bar_height"
        android:indeterminate="false"
        android:layout_alignTop="@+id/webView"
        android:progressDrawable="@drawable/progressbar_horizontal" />

</RelativeLayout>