Import wpt@4b9aa41c9c8c6c401ae4c541f36996d15fc45405

Using wpt-import in Chromium 52dded60a7c8b0c66637c35a9450744d99ef1581.
With Chromium commits locally applied on WPT:
68d5240e06 "[ChromeDriver] Set key modifiers with mouse actions"
2b037bdc25 "[Animation Worklet] Fix flaky worklet-animation-with-fill-mode.https.html"
fc735f1b74 "[IndexedDB] Fixed DisjointRangeLockManager usage in IndexedDB"


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:
bugsnash@chromium.org, ericwilligers@chromium.org, meade@chromium.org, nainar@chromium.org, rjwright@chromium.org, shend@chromium.org:
  external/wpt/css/css-cascade

NOAUTOREVERT=true
TBR=foolip

No-Export: true
Change-Id: I7ebebde98eec9f84249145cf4f9aa1865f6ef6ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514221
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@{#639486}
8 files changed