62 lines
2.1 KiB
JavaScript
62 lines
2.1 KiB
JavaScript
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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(function() {
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// The Mozilla DHTML performance tests need to explicitly call a function to
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// trigger the next page visit, rather than directly using the onload handler.
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// To meet needs of the DHTML performance tests without forking this head.js
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// file, use a variable |__install_onload_handler| to indicate whether the
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// |__onload| handler should be added to onload event listener.
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// Install |__onload| by default if there is no pre-configuration.
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if (typeof(__install_onload_handler) == 'undefined')
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var __install_onload_handler = true;
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// This is the timeout used in setTimeout inside the DHTML tests. Chrome has
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// a much more accurate timer resolution than other browsers do. This results
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// in Chrome running these tests much faster than other browsers. In order to
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// compare Chrome with other browsers on DHTML performance alone, set this
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// value to ~15.
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var __test_timeout = 0;
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function __set_cookie(name, value) {
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document.cookie = name + "=" + value + "; path=/";
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}
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function __onbeforeunload() {
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// Call GC twice to cleanup JS heap before starting a new test.
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if (window.gc) {
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window.gc();
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window.gc();
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}
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}
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// The function |__onload| is used by the DHTML tests.
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window.__onload = function() {
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// window.storeCreated is used by the Indexed DB tests.
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if ((!__install_onload_handler || window.storeCreated) &&
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!performance.timing.loadEventEnd)
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return;
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var unused = document.body.offsetHeight; // force layout
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testComplete(window.performance.now());
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};
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// The function |testComplete| is used by the Indexed DB tests.
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window.testComplete = function(time) {
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window.__pc_load_time = time;
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};
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// The function |__eval_later| now is only used by the DHTML tests.
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window.__eval_later = function(expression) {
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setTimeout(expression, __test_timeout);
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};
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if (window.parent == window) { // Ignore subframes.
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window.__pc_load_time = null;
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addEventListener("load", __onload);
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addEventListener("beforeunload", __onbeforeunload);
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}
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})();
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