Ignore children of void elements when serializing
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Implement step 6 of media `time marches on` algorithm. Improves stability of media WPTs
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This should help with the WPTs problems observed in https://github.com/servo/servo/pull/22348#issuecomment-446369831
Unfortunately, GStreamer does not seem to be very reliable with Ogg (check https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/issues/520) and most of the media-element WPTs uses a short ogv file, so I had to make our `canPlayType` report that it is not able to play this type to make the tests pick the alternative mp4 version of the same files. Once Ogg support for GStreamer improves, we should be able to revert this change.
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Implement performance interface extension for PerformanceResourceTiming
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(There is a previous closed pull for this #22431)
Implemented the following :
a) Added the maxSize Field to the PerformanceEntryList structure.
b) Implemented the clearResourceTimings, setResourceTimingBufferSize, onresourcetimingbufferfull fuctions for the Performance Structure according to the Interface Specification given at : https://w3c.github.io/resource-timing/#sec-extensions-performance-interface
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Implement URLSearchParams.prototype.sort()
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- [x] These changes fix#22545
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script: Implement the HTMLTrackElement API
Implement the basics of the HTMLTrackElement and update the wpt tests.
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Fixes: https://github.com/servo/servo/issues/22313
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Implement source for postMessage events
Also make similar-origin iframes access their newly loaded document as soon as the new document is created. This should allow tests that check the event.source property to run correctly.
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Serialize the children of void html elements as empty strings
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Construct URLSearchParams from array or object
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- [x] These changes fix#22554, fix#22556 and also fix#22557
- [x] There are tests in `url/urlsearchparams-constructor.any.js` for these changes
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Remove sync constellation -> embedder communication
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