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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/parser/innerHTML-setter-siblings.html Normal file
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<!DOCTYPE html>
<html>
<body>
<script src="../resources/runner.js"></script>
<script>
// Taken from http://jsperf.com/parse-html-type
// The major difference between this test and innerHTML-setter.html
// is that innerHTML-setter creates a single root node
// which avoids some of the costs in transplating nodes from the
// intermediary DocumentFragment to its final parent.
var tags = '<div></div><div></div><div></div><div></div><div></div>';
var attr = '<div foo="bar" foo="bar" foo="bar" foo="bar sda"></div>';
var nest = '<div><div><div><div><div></div></div></div></div></div>';
var tags10 = tags + tags + tags + tags + tags + tags + tags + tags + tags + tags;
var attr10 = attr + attr + attr + attr + attr + attr + attr + attr + attr + attr;
var nest10 = nest + nest + nest + nest + nest + nest + nest + nest + nest + nest;
var div = document.createElement('div');
PerfTestRunner.measureRunsPerSecond({
description: "This benchmark tests innerHTML setter for a large DOM tree",
run: function() {
div.innerHTML = tags10;
div.innerHTML = attr10;
div.innerHTML = nest10;
div.innerHTML = "";
}});
</script>
</body>
</html>