Add test data for spaceport benchmark.

chrome/test/data/third_party/spaceport/js/util/cacheBust.js

+define([ ], function () {
+    var cacheBust = {
+        buster: function buster() {
+            return String(Math.random()).replace(/[^0-9]/g, '');
+        },
+
+        url: function cacheBustUrl(url) {
+            if (/\?/.test(url)) {
+                return url + '&' + cacheBust.buster();
+            } else {
+                return url + '?' + cacheBust.buster();
+            }
+        }
+    };
+
+    return cacheBust;
+});