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tests: Vendor blink perf tests (#38654)

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Vendors the [blink perf
tests](https://chromium.googlesource.com/chromium/src/+/HEAD/third_party/blink/perf_tests/).
These perf tests are useful to evaluate the performance of servo. 
The license that governs the perf tests is included in the folder. 
Running benchmark cases automatically is left to future work.

The update.py script is taken from mozjs and slightly adapted, so we can
easily filter
(and patch if this should be necessary in the future.

Testing: This PR just adds the perf_tests, but does not use or modify
them in any way.

---------

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
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Jonathan Schwender 2025-08-17 11:54:04 +02:00 • committed by GitHub
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tests/blink_perf_tests/perf_tests/layout/line-layout-repeat-append-select.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>Performance test for appending inline items one at a time and setting selection</title>
<meta charset="utf-8">
<script src="../resources/runner.js"></script>
</head>
<body>
<div id="container"></div>
<script>
const pangrams = [
'Amazingly few discotheques provide jukeboxes.',
'All questions asked by five watched experts amaze the judge.',
'Pack my box with five dozen liquor jugs.',
'Sphinx of black quartz, judge my vow!',
'My faxed joke won a pager in the cable TV quiz show.'
];
function addItem(container, text) {
container.appendChild(document.createTextNode(text));
container.appendChild(document.createElement('br'));
}
function test() {
const container = document.createElement('div');
document.body.appendChild(container);
for (var i = 0; i < 100; i++) {
addItem(container, i + ') ' + pangrams[i % 5]);
PerfTestRunner.forceLayout();
getSelection().collapse(container.lastChild, 0);
getSelection().removeAllRanges();
}
document.body.removeChild(container);
}
PerfTestRunner.measureRunsPerSecond({
description: 'Measures performance of appending inline ' +
'items one at a time and setting selection',
run: test
});
</script>
</body>
</html>