virtual/threaded/fast/scroll-behavior/smooth-scroll/ongoing-smooth-scroll-vertical-rl-anchors.html is flaky on Linux bots. It's timing out.

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=virtual%2Fthreaded%2Ffast%2Fscroll-behavior%2Fsmooth-scroll%2Fongoing-smooth-scroll-vertical-rl-anchors.html