Both gears and snow should detect if Path is available, and also report on the console if present.

experimental/SkV8Example/snow.js

 var IS_SKV8 = typeof document == "undefined";
+var HAS_PATH = typeof Path != "undefined";
 
 function circlePath(r) {
-  if (IS_SKV8) {
+  if (HAS_PATH) {
     var p = new Path();
-    p.oval(0, 0, r, r);
+    p.arc(0, 0, r, 0, 2*Math.PI);
     p.closePath();
     return p;
   } else {
     return null;
   }
 }
 
 var onDraw = function() {
   var W = 500;
   var H = 500;
@@ skipping 24 matching lines @@
       p.y += 0.6*p.r;
       if (p.x > W) {
         p.x-=W;
       }
       if (p.x < 0) {
         p.x += W;
       }
       if(p.y>(H+1)){
         p.y = 0;
       }
-      if (IS_SKV8) {
+      if (HAS_PATH) {
         ctx.save();
         ctx.translate(p.x, p.y);
         ctx.fill(p.path);
         ctx.restore();
       } else {
         ctx.beginPath();
         ctx.moveTo(p.x, p.y);
         ctx.arc(p.x, p.y, p.r, 0, 2*Math.PI, true);
         ctx.closePath();
         ctx.fill();
@@ skipping 21 matching lines @@
   window.onload = function(){
     var canvas = document.getElementById("snow");
     var ctx = canvas.getContext("2d");
     function drawCallback() {
       onDraw(ctx);
       setTimeout(drawCallback, 1);
     }
     setTimeout(drawCallback, 1);
   }
 }
+
+console.log("HAS_PATH: " + HAS_PATH);