Javascript Interface?

I had a javascript interface working on Android, but not what I've moved the code to forms it doesn't appear to be working.
I set it up the same way as I did in Android in my android version of the Custom Render for the WebView:

        nativeWebView.Settings.JavaScriptEnabled = true;
        var javaScriptInterface = new JavaScriptInterface(Context);
        nativeWebView.AddJavascriptInterface(javaScriptInterface, "androidInterface");

and my webpage contains the same javascript code that worked in the Android version:

<script type="text/javascript">
    $('div[data-role="page"]').bind('pagecreate', function () {
        androidInterface.TimedOut("@Model.URL");
    });
</script>

and the interface class is exactly the same as the android version, and lives in the android specific section of the forms project:

namespace JMAS.Droid.Interfaces
{
public class JavaScriptInterface : Java.Lang.Object
{
    private readonly Context _context;

    public JavaScriptInterface(Context context)
    {
        _context = context;
    }

    [Export]
    public void TimedOut(string redirectUrl)
    {
        JMAS.Interfaces.JavaScriptInterface.OnTimeOut();

    } 

When I test a break point in the TimedOut function is never hit. Am I missing something, or is this a bug?