Skip background-color-outside-document.html which increases flakiness
Skip background-color-outside-document.html which increases flakiness

background-color-outside-document.html leaves the renderer in a
bad state and subsequent tests will fail. This patch temporarily
skips the test while we investigate further.

Test:
Tools/Scripts/run-webkit-tests LayoutTests/compositing/background-color/ LayoutTests/css3/flexbox/ --no-retry-failures --child-processes=1 --no-show-results

Flakiness starting when [1] landed:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=css3%2Fflexbox%2Frepaint.html&testType=layout-tests

[1] https://chromium.googlesource.com/chromium/src/+/9fc5dc594b349a064dec407084442b70a1d602f0

BUG=570893,571233
TBR=skobes@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1535323002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#366268}

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