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add_task(function*() {
// Make the min_background_timeout_value very high to avoid problems on slow machines
yield new Promise(resolve => SpecialPowers.pushPrefEnv({
'set': [['dom.min_background_timeout_value', 3000]]
}, resolve));
// Make a new tab, and put it in the background
yield BrowserTestUtils.withNewTab("about:blank", function*(browser) {
yield BrowserTestUtils.withNewTab("about:blank", function*() {
let time = yield ContentTask.spawn(browser, null, function () {
return new Promise(resolve => {
let start = content.performance.now();
let id = content.window.setInterval(function() {
let end = content.performance.now();
content.window.clearInterval(id);
resolve(end - start);
}, 0);
});
});
ok(time > 2000, "Interval is throttled with no webaudio (" + time + " ms)");
time = yield ContentTask.spawn(browser, null, function () {
return new Promise(resolve => {
// Create an audio context, and save it on the window so it doesn't get GCed
content.window._audioCtx = new content.window.AudioContext();
let start = content.performance.now();
let id = content.window.setInterval(function() {
let end = content.performance.now();
content.window.clearInterval(id);
resolve(end - start);
}, 0);
});
});
ok(time < 1000, "Interval is not throttled with an audio context present (" + time + " ms)");
});
});
});
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