Add test data for spaceport benchmark.

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

+define([ 'util/ensureCallback' ], function (ensureCallback) {
+    return function timeout(duration, fn, callback) {
+        callback = ensureCallback(callback);
+
+        var id = setTimeout(function () {
+            callback(new Error('Operation timed out'));
+        }, duration);
+
+        fn(function () {
+            clearTimeout(id);
+            callback.apply(this, arguments);
+        });
+    };
+});