mozilla-central/testing/web-platform/tests/performance-timeline/po-callback-mutate.any.js (file symbol)

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// META: script=performanceobservers.js
async_test(function (t) {
var callbackCount = 0;
var observer = new PerformanceObserver(
t.step_func(function (entryList, obs) {
callbackCount++;
if (callbackCount === 1) {
checkEntries(entryList.getEntries(), [
{entryType: "measure", name: "measure1"},
]);
observer.observe({entryTypes: ["mark"]});
self.performance.mark("mark2");
self.performance.measure("measure2");
return;
}
if (callbackCount === 2) {
checkEntries(entryList.getEntries(), [
{entryType: "mark", name: "mark2"},
]);
self.performance.mark("mark-before-change-observe-state-to-measure");
self.performance.measure("measure-before-change-observe-state-to-measure");
observer.observe({entryTypes: ["measure"]});
self.performance.mark("mark3");
self.performance.measure("measure3");
return;
}
if (callbackCount === 3) {
checkEntries(entryList.getEntries(), [
{entryType: "measure", name: "measure3"},
{entryType: "mark", name: "mark-before-change-observe-state-to-measure"},
]);
self.performance.mark("mark-before-change-observe-state-to-both");
self.performance.measure("measure-before-change-observe-state-to-both");
observer.observe({entryTypes: ["mark", "measure"]});
self.performance.mark("mark4");
self.performance.measure("measure4");
return;
}
if (callbackCount === 4) {
checkEntries(entryList.getEntries(), [
{entryType: "measure", name: "measure-before-change-observe-state-to-both"},
{entryType: "measure", name: "measure4"},
{entryType: "mark", name: "mark4"},
]);
self.performance.mark("mark-before-disconnect");
self.performance.measure("measure-before-disconnect");
observer.disconnect();
self.performance.mark("mark-after-disconnect");
self.performance.measure("measure-after-disconnect");
t.done();
return;
}
assert_unreached("The callback must not be invoked after disconnecting");
})
);
observer.observe({entryTypes: ["measure"]});
self.performance.mark("mark1");
self.performance.measure("measure1");
}, "PerformanceObserver modifications inside callback should update filtering and not clear buffer");