Custom coloring of countries in Google Maps : GWT?

Question

I am trying to add a custom fusion table styling to my Google Map. Similar to here: https://developers.google.com/maps/documentation/javascript/examples/layer-fusiontables-styling

I want to color a country based on a particular value assigned to it let's say 0 = green, 50 = yellow and 100=red.

I have a Fusion table set up here: https://www.google.com/fusiontables/DataSource?docid=1tJkzVXTv-B2-rFeQVO9bX_vICCvJ9Xq1LU6xog5f
and I am able to achieve desired result here but not in my code.

I am using Google Maps API V3 with GWT.

    private void setupFusionTablesLayer(final MapWidget mapWidget) {

    final String select = "geometry";
    final String from = "1tJkzVXTv-B2-rFeQVO9bX_vICCvJ9Xq1LU6xog5f";
    final String where = "risk >= 0";

    final FusionTablesStyle fusionTablesStyle = FusionTablesStyle
            .newInstance();
    final FusionTablesPolygonOptions polygonOptions = FusionTablesPolygonOptions
            .newInstance();
    polygonOptions.setFillColor("#505050"); // grey
    polygonOptions.setFillOpacity(0.3);
    fusionTablesStyle.setPolygonOptions(polygonOptions);

    final FusionTablesQuery query = FusionTablesQuery.newInstance();
    query.setSelect(select);
    query.setFrom(from);
    query.setWhere(where);

    final FusionTablesLayerOptions options = FusionTablesLayerOptions
            .newInstance();
    options.setQuery(query);

    final JsArray arr = JavaScriptObject.createArray().cast();
    arr.push(fusionTablesStyle);
    options.setStyles(arr);

    final FusionTablesLayer layer = FusionTablesLayer.newInstance(options);
    layer.addClickHandler(new FusionTablesMouseMapHandler() {
        @Override
        public void onEvent(final FusionTablesMouseMapEvent event) {

            event.getInfoWindowHtml();
            final LatLng latlng = event.getLatLng();

            event.getPixelOffset();

            event.getRow();
            final String json = event.getRowAsJson();
            GWT.log("click on " + latlng.getToString() + "  json=" + json);
        }
    });
    layer.setMap(mapWidget);
}

This is what I have so far:

I have no clue why it is all red!!

Please help.
Thanks

EDIT#1 I did the code change and was able to change the whole map color to grey. But still not sure how to get risk column's value and update per country color.