Import wpt@b8251ea96a23673c8cb401662c5b0f225d651bd3

Using wpt-import in Chromium ad1c134757cfec94b6d7566eb77fb5358b1f7af0.

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:
ericwilligers@chromium.org:
  external/wpt/css/motion

NOAUTOREVERT=true
TBR=robertma

No-Export: true
Change-Id: Ie0c52222479772924365675600bd2e9ad1899125
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020843
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@{#735246}
8 files changed