title: how to create a Polyline in google map v3 , and make it enableDrawing
body: <p>this code is in v2:</p>
  
  <pre><code>var polyline = new GPolyline([point1,point2], "#ff0000", 5);
  map.addOverlay(polyline);
  polyline.enableDrawing();
  </code></pre>
  
  <p>and how to do in v3 ??</p>
  
  <p>thanks</p>