Skip imported timing tests that are too flaky on Win
Skip imported timing tests that are too flaky on Win

A pair of user-timing timing tests imported from web-platform-tests
have a threshold that's too low for our Windows bots. I filed an
upstream bug[1] to try and improve the tests, but in lieu of that
we should skip them on Windows since they aren't giving us good
data.

[1] https://github.com/w3c/web-platform-tests/issues/2115

NOTRY=true
TBR=ojan@chromium.org
BUG=518992,518993

Review URL: https://codereview.chromium.org/1308393010

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@201926 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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