Add test data for spaceport benchmark.

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

Index: chrome/test/data/third_party/spaceport/js/util/chainAsync.js
diff --git a/chrome/test/data/third_party/spaceport/js/util/chainAsync.js b/chrome/test/data/third_party/spaceport/js/util/chainAsync.js
new file mode 100644
index 0000000000000000000000000000000000000000..50a180a37718c621524cc8cc8eb0cca6460034d7
--- /dev/null
+++ b/chrome/test/data/third_party/spaceport/js/util/chainAsync.js
@@ -0,0 +1,18 @@
+define([ ], function () {
+    return function chainAsync(functions) {
+        functions = functions.slice();
+
+        function next() {
+            if (functions.length === 0) {
+                return;
+            }
+
+            var fn = functions.shift();
+            fn(function () {
+                setTimeout(next, 0);
+            });
+        }
+
+        setTimeout(next, 0);
+    };
+});