| promise_test(() => { |
| // The first promise waits for one buffered flag observer to receive 3 entries. |
| const promise1 = new Promise(resolve1 => { |
| let numObserved1 = 0; |
| new PerformanceObserver((entryList, obs) => { |
| // This buffered flag observer is constructed after a regular observer detects a mark. |
| new PerformanceObserver(list => { |
| numObserved1 += list.getEntries().length; |
| if (numObserved1 == 3) |
| resolve1(); |
| }).observe({type: 'mark', buffered: true}); |
| obs.disconnect(); |
| }).observe({entryTypes: ['mark']}); |
| performance.mark('foo'); |
| }); |
| // The second promise waits for another buffered flag observer to receive 3 entries. |
| const promise2 = new Promise(resolve2 => { |
| step_timeout(() => { |
| let numObserved2 = 0; |
| // This buffered flag observer is constructed after a delay of 100ms. |
| new PerformanceObserver(list => { |
| numObserved2 += list.getEntries().length; |
| if (numObserved2 == 3) |
| resolve2(); |
| }).observe({type: 'mark', buffered: true}); |
| }, 100); |
| performance.mark('bar'); |
| }); |
| performance.mark('meow'); |
| // Pass if and only if both buffered observers received all 3 mark entries. |
| return Promise.all([promise1, promise2]); |
| }, 'Multiple PerformanceObservers with buffered flag see all entries'); |