Import wpt@5756870d039495439b8512c26db05f25aaa3a0d7

Using wpt-import in Chromium a6f1fc99e153f0b48e67ad0a17c4b56cb3beff91.

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:
kojii@chromium.org, mstensho@chromium.org:
  external/wpt/css/CSS2
mstensho@chromium.org:
  external/wpt/css/css-multicol

NOAUTOREVERT=true
TBR=robertma@google.com

No-Export: true
Change-Id: I97d8021bdc61bcf50b61f7717b02f0f879f52d69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252879
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@{#780065}

diff --git a/third_party/blink/web_tests/SlowTests b/third_party/blink/web_tests/SlowTests
index 681fdc1b..f6abd2c 100644
--- a/third_party/blink/web_tests/SlowTests
+++ b/third_party/blink/web_tests/SlowTests

@@ -538,4 +538,4 @@
 crbug.com/1043669 [ Mac ] inspector-protocol/emulation/set-vision-deficiency.js [ Slow ]
 crbug.com/1092121 fast/css/large-list-of-rules-crash.html [ Slow ]
 
-crbug.com/1042205 virtual/off-main-thread-css-paint/external/wpt/css/css-paint-api/paint2d-filter.https.html [ Slow ]
\ No newline at end of file
+crbug.com/1042205 virtual/off-main-thread-css-paint/external/wpt/css/css-paint-api/paint2d-filter.https.html [ Slow ]