Mark virtual/deferred/inspector/timeline/timeline-window-filter.html as timeout on debug
Mark virtual/deferred/inspector/timeline/timeline-window-filter.html as timeout on debug

This test has been constantly failing on win/mac debg bots. See:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=virtual/deferred/inspector/timeline/timeline-window-filter.html

BUG=344238
TBR=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/226813002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@170915 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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