Per #18108, add `buffered` flag in the `PerformanceObserverInit` dict.
Per W3C spec, when `buffered` is set, `PerformanceObserver.observe()` method adds the entries buffered in the `Performance` instance into the observer's entry buffer.
One step is the implementation of the [filter by name and type](https://w3c.github.io/performance-timeline/#filter-buffer-by-name-and-type) algorithm. Don't think that the sort operation is useful in this case, but the spec states that this algorithm is to be used.
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#18108
- [X] These changes do not require tests (yet) because the timeline API is not powered.
Source-Repo: https://github.com/servo/servo
Source-Revision: ced303b9cbc193b5ebf221cbf2048ac1e7d0d552
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#18111
- [X] There are tests for these changes
Source-Repo: https://github.com/servo/servo
Source-Revision: 173079c14498f0ef4810ffbaf8f4c03acf557eed
[Performance Timeline API](https://www.w3.org/TR/performance-timeline-2/) implementation.
This API is required to allow DOM access to the [Paint Timing API](https://wicg.github.io/paint-timing/#example) metrics implemented in #17256. Unfortunately, I couldn't test it properly, as its usage depends on other APIs like the Paint Timing, User Timing, Resource Timing or Server Timing APIs. I'll work in the integration with the Paint Timing API next.
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] There are [WPTs](https://github.com/servo/servo/tree/master/tests/wpt/web-platform-tests/performance-timeline) for this API, however they depend on the implementation of the User Timing and the Resource Timing APIs, which I'll hopefully be implementing soon.
Source-Repo: https://github.com/servo/servo
Source-Revision: 6988c7424ddfdd9a98e6a458ff2ad307a74237aa
