[resources] Wait for document.fonts.ready
in checkLayout()
tests
#49556
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Implements most of web-platform-tests/rfcs#213 and fixes up tests that use
checkLayout()
with extratest()
s or other synchronous code, which now have to live inpromise_setup()
orpromise_test()
s to be part of the promise test queue.A follow-up PR will clean up obsolete
document.fonts.ready.then(() => checkLayout(...))
.