Import wpt@cf05949faebaec0009dc50d494cd91b0175df678

Using wpt-import in Chromium 5c243308.
With Chromium commits locally applied on WPT:
d5cd6b98 "SharedWorker: Assign unique names to SharedWorkers to avoid unintentional matching"
acf33020 "Add testing for the scrolling attribute"
3254ad50 "[ScrollTimeline] Support composited scroll-linked Web Animation"
8847f636 "MixedContent: Add WPTs for subresource fetching from workers"
51efe83e "InsecureRequestPolicy: Add WPTs for subresource fetching from workers"
e423572a "Reveal only the initial frame URL in performance.measureMemory"


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

NOAUTOREVERT=true
TBR=robertma

No-Export: true
Change-Id: Id3a26b60cb1117f8680cdb6248884e77c5646fe6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100531Reviewed-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@{#749768}

third_party/blink/web_tests/external/wpt/tools/wptrunner/requirements_firefox.txt

@@ -6,6 +6,6 @@ mozleak==0.2
 moznetwork==1.1.0
 mozprocess==1.0.0
 mozprofile==2.5.0
-mozrunner==7.7.0
+mozrunner==7.8.0
 mozversion==2.3.0
 psutil==5.7.0