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const run_test = isolated => {
// Multiplier to convert the clamped timestamps to microseconds.
const multiplier = 1000;
const windowOrigin = performance.timeOrigin;
// Clamp to at least 5 microseconds in isolated contexts and at least 100 in
// non-isolated ones.
const resolution = isolated ? 5 : 100;
const create_worker = () => {
return new Promise(resolve => {
const workerScript = 'postMessage({timeOrigin: performance.timeOrigin})';
const blob = new Blob([workerScript]);
const worker = new Worker(URL.createObjectURL(blob));
worker.addEventListener('message', event => {
resolve(event.data.timeOrigin);
});
});
};
promise_test(async t => {
assert_equals(self.crossOriginIsolated, isolated,
"crossOriginIsolated is properly set");
let prev = windowOrigin;
let current;
for (let i = 1; i < 100; ++i) {
current = await create_worker();
assert_true(current === prev || current - prev > resolution / 1000);
prev = current;
}
}, 'timeOrigins are clamped.');
};
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