OS: Win 10
Bot: win10_chromium_x64_rel_ng
Test: SitePerProcessHitTestBrowserTest.InputEventRouterGestureTargetMapTest

On that win10 bot the test is failing 8% of the time with the error:

../../content/browser/site_per_process_hit_test_browsertest.cc(2272): error: Expected equality of these values:
  nullptr
    Which is: NULL
  router_touch_target
    Which is: 00000209DC47C4E0

Flakiness board also shows that there might be something wrong on win 7 too: https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=content_browsertests%20(with%20patch)&tests=SitePerProcessHitTestBrowserTest.InputEventRouterGestureTargetMapTest