Automatic update from web-platform-tests [IntersectionObserver] Upstream V2 tests to wpt BUG=827639 Change-Id: I38fcdd0ae40cd3122541ffa8521d4ee30adffc22 Reviewed-on: https://chromium-review.googlesource.com/c/1447267 Reviewed-by: Chris Harrelson <chrishtr@chromium.org> Reviewed-by: Philip Jägenstedt <foolip@chromium.org> Commit-Queue: Stefan Zager <szager@chromium.org> Cr-Commit-Position: refs/heads/master@{#631836} -- wpt-commits: 4122c04d5d5fb30cf69f5c8ca993d74162688884 wpt-pr: 15175