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These tests are already doing fairly well on Chrome:
https://wpt.fyi/css/css-masking

However, there's also at least one Chrome-only failure:
https://wpt.fyi/css/css-masking/parsing/clip-path-invalid.html

Note that some of the tests are still problematic:
https://wpt.fyi/css/css-masking/clip-path
https://github.com/w3c/web-platform-tests/issues/7543#issuecomment-388744004

No-Try: true
Change-Id: I036e08fd44b12291f8fcce386b67b7d5897365da
Reviewed-on: https://chromium-review.googlesource.com/1057090Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558643}