Import wpt@a52c81089a0cc2356edab19e505f048eb14c0fce

Using wpt-import in Chromium 55877000e05eb3a777ad0c7c2fe162dc941111c7.
With Chromium commits locally applied on WPT:
c64e59c2ac "Deflake RTCPeerConnection-track-stats.https.html."
14c111075b "Implement `Sec-CH-Lang`"


Note to sheriffs: 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/+/master/docs/testing/web_platform_tests.md

Directory owners for changes in this CL:
foolip@chromium.org, robertma@chromium.org, smcgruer@chromium.org:
  external/wpt/infrastructure
jsbell@chromium.org, mek@chromium.org:
  external/wpt/webstorage
mstensho@chromium.org:
  external/wpt/css/css-multicol
rego@igalia.com:
  external/wpt/css/css-ui

NOAUTOREVERT=true
TBR=raphael.kubo.da.costa

No-Export: true
Change-Id: I660bfa53040b8ddf06c2b798375f7fba49d5bf66
Reviewed-on: https://chromium-review.googlesource.com/c/1452478
Reviewed-by: WPT Autoroller <wpt-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: WPT Autoroller <wpt-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#628843}
204 files changed