Import wpt@c11e4cc54d35d29fc113ca548de5753837adbffc

Using wpt-import in Chromium 808f0414bf147a5505869b075ab0d572dbfcf51f.
With Chromium commits locally applied on WPT:
bc7ec54895 "MSE: Test addSourceBuffer and changeType relaxed type strictness and allowance for implicit changeType"


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:
rego@igalia.com:
  external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests

NOAUTOREVERT=true
TBR=lukebjerring

No-Export: true
Change-Id: Ic5ef64c71cb39aa06ea8309e76de81a78242e4e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1681952
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@{#673444}
6 files changed