Import wpt@87f87e1276cdbf9f4af14dcb12d3d7bc1200d7c5

Using wpt-import in Chromium 7f34b9292e85576392e64f59493ef2138a31c5a0.

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, lpz@chromium.org, robertma@chromium.org:
  external/wpt/tools
hbos@chromium.org, hta@chromium.org:
  external/wpt/webrtc

NOAUTOREVERT=true
TBR=lpz

No-Export: true
Change-Id: Ib302f6b2bfc3699af46247ece09b334b147c68ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539694
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@{#644397}