Add a setTimer() function.

experimental/SkV8Example/sample.js

Index: experimental/SkV8Example/sample.js
diff --git a/experimental/SkV8Example/sample.js b/experimental/SkV8Example/sample.js
index 3a95e551069c49bb230179098daf7a91af909c3d..b5160620448e2c5a7bff896ef1fb58a9be66bc16 100644
--- a/experimental/SkV8Example/sample.js
+++ b/experimental/SkV8Example/sample.js
@@ -4,10 +4,17 @@
 var onDraw = function(){
   var tick = 0;
   function f(canvas) {
-    tick += 0.01;
+    tick += 0.1;
     canvas.fillStyle = '#0000ff';
     canvas.fillRect(100, 100, Math.sin(tick)*100, Math.cos(tick)*100);
-    canvas.inval();
   };
   return f;
 }();
+
+function onTimeout() {
+  inval();
+  print("Got a timeout!");
+  setTimeout(onTimeout, 33);
+}
+
+setTimeout(onTimeout, 33);