Fleshed out a lot of the Path interfac

experimental/SkV8Example/speed.js

 /**
  * @fileoverview Sample onDraw script for use with SkV8Example.
  */
 var onDraw = function(){
   var tick = 0;
   function f(canvas) {
     tick += 0.1;
     canvas.fillStyle = '#0000ff';
     canvas.fillRect(100, 100, Math.sin(tick)*100, Math.cos(tick)*100);
+    inval();
   };
+
+  function onTimeout() {
+      print(tick*10, " FPS");
+      setTimeout(onTimeout, 1000);
+      tick=0;
+  }
+
+  setTimeout(onTimeout, 1000);
+
   return f;
 }();
 
-function onTimeout() {
-  inval();
-  print(setTimeout(onTimeout, 33));
-}
-
-setTimeout(onTimeout, 33);