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

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/theme_browser_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/tab_background"
        app:tabIndicatorColor="@color/tab_indicator" />

    <org.wordpress.android.widgets.WPViewPager
        android:id="@+id/media_picker_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>