make the drawing handlers create the sketch feature at an appropriate time, when we can actually derive geographic coordinates from a pixel, r=ahocevar (References #3327)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12046 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/measure.html

@@ -29,6 +29,7 @@
     <script src="../lib/OpenLayers.js"></script>
     <script type="text/javascript">
         var map, measureControls;
+        OpenLayers.Layer.Vector.prototype.renderers = ["SVG2", "VML", "Canvas"];
         function init(){
             map = new OpenLayers.Map('map');