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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- [x] These changes fix#22499 and fix#12715 and fix#22514.
- [x] There are tests for these changes
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refactoring with ResourceFetchMetadata
implemented deprecated window.timing functionality
created ResourceTimingListener trait
fixed w3c links in navigation timing
updated include.ini to run resource timing tests on ci
Annotate insertAdjacentHTML with CEReactions
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Only run DOMTokenList update steps if token was found
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