Support hiding statistics for specific scenes

This way it's possible to see side-by-side results of CPU and GPU time on "fast"
scenes, without having Victor scene making bars for bmw really tiny.

benchmark/website/latest_snapshot.html

@@ -23,6 +23,8 @@
         var chart_ctx = document.getElementById("canvas").getContext("2d");
         buildChart(chart_ctx, data);
 
+        buildScenesSelector(document.getElementById("container"), data);
+
         var table_ctx = document.getElementById("spreadsheet");
         buildSpreadsheet(table_ctx, data);
       };