Import wpt@00668dccbfd2a4d51de6978f0ebed197371c7af7

https://github.com/web-platform-tests/wpt/compare/3e96c791b...00668dccb

Using wpt-import in Chromium d4d710360b0478f8f21ae3d68828fc7cff2c66c5.
With Chromium commits locally applied on WPT:
  c178061101 "[LCP WPT] Fix test expectation in background-image- [...]
  059f14c1e8 "webrtc: ensure tracks are muted initially and unmute [...]
  c3b452e5cf "Revert "webrtc: ensure tracks are muted initially [...]

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
R=rubber-stamper@appspot.gserviceaccount.com

No-Export: true
Validate-Test-Flakiness: skip
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Change-Id: Iae8aa3c32aaeaf168475d4cf995c55879266c85b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6641331
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: WPT Autoroller <wpt-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1473995}