<!-- I want to set the toolbarStyle for all toolbars here, including the overlay android:theme -->
<style name="AppThemeAppCompat" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>

        <item name="toolbarStyle">@style/ToolbarStyle</item>
        <item name="drawerArrowStyle">@style/DrawerArrowStyle</item>
</style>

<!-- I want all toolbars by default to be styled like this -->
<style name="ToolbarStyle" parent="Widget.AppCompat.Toolbar">
        <item name="android:background">?colorPrimary</item>
        <item name="android:minHeight">?actionBarSize</item>
        <item name="popupTheme">@style/ThemeOverlay.AppCompat.Light</item>
        <item name="android:theme">@style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>

<!-- In a layout I want to just use a toolbar like: -->
<android.support.v7.widget.Toolbar
        android:id="@+id/sign_in_toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
<!-- This toolbar doesn't pick up the android:theme attribute from styles -->