session-android/res/layout/search_toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_height="wrap_content"
       android:layout_width="match_parent"
       tools:parentTag="android.widget.LinearLayout"
       tools:orientation="vertical">

    <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/search_toolbar_background"/>

    <View android:layout_width="match_parent"
          android:layout_height="4dp"
          android:background="@drawable/search_toolbar_shadow"/>

</merge>