Revert of Clean up perftesthelper.js style

tools/perf/page_sets/tough_animation_cases/resources/perftesthelper.js

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+(function(){
+'use strict';
+
+if (window.PerfTestHelper) {
+  return;
+}
+window.PerfTestHelper = {};
+
+var randomSeed = 3384413;
+window.PerfTestHelper.random = function() {
+    var temp = randomSeed;
+    // Robert Jenkins' 32 bit integer hash function.
+    temp = ((temp + 0x7ed55d16) + (temp << 12))  & 0xffffffff;
+    temp = ((temp ^ 0xc761c23c) ^ (temp >>> 19)) & 0xffffffff;
+    temp = ((temp + 0x165667b1) + (temp << 5))   & 0xffffffff;
+    temp = ((temp + 0xd3a2646c) ^ (temp << 9))   & 0xffffffff;
+    temp = ((temp + 0xfd7046c5) + (temp << 3))   & 0xffffffff;
+    temp = ((temp ^ 0xb55a4f09) ^ (temp >>> 16)) & 0xffffffff;
+    randomSeed = temp;
+    return (randomSeed & 0xfffffff) / 0x10000000;
+};
+
+window.PerfTestHelper.getParameter = function(parameter) {
+    var match = new RegExp(parameter + '=([^&]*)').exec(window.location.search);
+    if (match) {
+        return match[1];
+    }
+    return null;
+}
+
+window.PerfTestHelper.getN = function(defaultN) {
+    var match = PerfTestHelper.getParameter('N');
+    if (match) {
+        var n = Number(match);
+        if (isNaN(n)) {
+            throw 'Invalid N value: ' + match;
+        }
+        return n;
+    }
+    if (typeof defaultN === 'undefined') {
+        throw 'Default N value required';
+    }
+    return defaultN;
+};
+
+window.PerfTestHelper.signalReady = function() {
+    requestAnimationFrame(function() {
+        // FIXME: We must wait at least two frames before
+        // measuring to allow the GC to clean up the
+        // previous test.
+        requestAnimationFrame(function() {
+            window.measurementReady = true;
+        });
+    });
+};
+
+})();