Import wpt@27c8d234ee83a4b15f36ad10cc26c951b1782fb6

https://github.com/web-platform-tests/wpt/compare/8061be32d...27c8d234e

Using wpt-import in Chromium d289c5d0cd0948efb6d8f02f1e776f4fbc493de2.
With Chromium commits locally applied on WPT:
  5841a8c6f2 "Better box decoration cloning around monolithic content."
  19e96045ce "Fix test timeouts by adding a postMessage ack on [...]

Note to gardeners: This CL imports external tests and adds expectations
for those tests; if this CL is large and causes a few new failures,
please fix the failures by adding new lines to TestExpectations rather
than reverting. See:
https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md

NOAUTOREVERT=true

No-Export: true
Validate-Test-Flakiness: skip
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Change-Id: Ifb93f1b56d759bcf2cdf5e7e11f004ab20739661
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5725494
Auto-Submit: WPT Autoroller <wpt-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Reviewed-by: An Sung <ansung@google.com>
Commit-Queue: An Sung <ansung@google.com>
Cr-Commit-Position: refs/heads/main@{#1330341}