Add test data for spaceport benchmark.

chrome/test/data/third_party/spaceport/js/sprites/container.js

+define([ ], function () {
+    function container() {
+        var el = document.createElement('div');
+        el.style.overflow = 'hidden';
+        el.style.position = 'absolute';
+        el.style.left = '0';
+        el.style.top = '0';
+        el.style.width = '512px';
+        el.style.height = '512px';
+        el.style.background = '#FFFFFF';
+        return el;
+    }
+
+    return container;
+});