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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>
This commit is contained in:
Jonathan Schwender 2025-08-17 11:54:04 +02:00 • committed by GitHub
parent 7621332824
commit ee781b71b4
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tests/blink_perf_tests/perf_tests/editing/textarea-dom.html Normal file
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<!DOCTYPE html>
<body>
<style>
textarea:valid {
background-color: lime;
}
textarea:invalid {
background-color: red;
}
</style>
<script src="../resources/runner.js"></script>
<textarea maxlength=2147483647 id="container"></textarea>
<script>
var container = document.getElementById('container');
var nodes = [];
var childCount = 1000;
// Vary the text nodes added, avoiding secondary effects of using identical strings and allocation reuse.
for (var i = 0; i < childCount; ++i)
nodes.push(document.createTextNode('A quick brown fox jumps over the ' + i + 'th lazy dog.\n'));
PerfTestRunner.measureRunsPerSecond({
description: "Measures performance of adding text nodes to a textarea, then clearing it.",
run: function() {
for (var i = 0; i < childCount; ++i)
container.appendChild(nodes[i]);
container.innerHTML = '';
}
});
</script>
</body>