Revert 194260 "Revert 194220 "[Telemetry] Make page cyclers more..."

trunk/src/tools/perf/perf_tools/page_cycler.js

 // Copyright (c) 2013 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() {
 // The Mozilla DHTML performance tests need to explicitly call a function to
 // trigger the next page visit, rather than directly using the onload handler.
 // To meet needs of the DHTML performance tests without forking this head.js
 // file, use a variable |__install_onload_handler| to indicate whether the
 // |__onload| handler should be added to onload event listener.
@@ skipping 40 matching lines @@
 // The function |__eval_later| now is only used by the DHTML tests.
 window.__eval_later = function(expression) {
   setTimeout(expression, __test_timeout);
 };
 
 if (window.parent == window) {  // Ignore subframes.
   addEventListener("load", __onload);
   addEventListener("beforeunload", __onbeforeunload);
 }
 })();