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

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.
-// Install |__onload| by default if there is no pre-configuration.
-if (typeof(__install_onload_handler) == 'undefined')
-  var __install_onload_handler = true;
-
-// This is the timeout used in setTimeout inside the DHTML tests.  Chrome has
-// a much more accurate timer resolution than other browsers do.  This results
-// in Chrome running these tests much faster than other browsers.  In order to
-// compare Chrome with other browsers on DHTML performance alone, set this
-// value to ~15.
-var __test_timeout = 0;
-
-function __set_cookie(name, value) {
-  document.cookie = name + "=" + value + "; path=/";
-}
-
-function __onbeforeunload() {
-  // Call GC twice to cleanup JS heap before starting a new test.
-  if (window.gc) {
-    window.gc();
-    window.gc();
-  }
-
-  __set_cookie("__pc_load_time", "");
-}
-
-// The function |__onload| is used by the DHTML tests.
-window.__onload = function() {
-  // window.storeCreated is used by the Indexed DB tests.
-  if ((!__install_onload_handler || window.storeCreated) &&
-      !performance.timing.loadEventEnd)
-    return;
-
-  var unused = document.body.offsetHeight;  // force layout
-
-  __set_cookie("__pc_load_time", window.performance.now());
-};
-
-// The function |testComplete| is used by the Indexed DB tests.
-window.testComplete = __onload;
-
-// 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);
-}
-})();