<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test-pre.js"></script>
<script>
description("Tests that the Performance wrapper stays alive for as long as its frame.");
jsTestIsAsync = true;

shouldBe("window.performance.__proto__", "Performance.prototype");
shouldBeUndefined("window.performance.customProperty");
evalAndLog("window.performance.customProperty = 1");
shouldBe("window.performance.customProperty", "1");
gc();
shouldBe("window.performance.customProperty", "1");

onload = function() {
    gc();
    shouldBe("window.performance.customProperty", "1");
    setTimeout(checkAndFinish, 0);
}

function checkAndFinish()
{
    gc();
    shouldBe("window.performance.customProperty", "1");
    finishJSTest();
}
</script>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>