Chrome Version: 61.0.3119.0
OS: Chrome

SitePerProcessBrowserTest.SubframeGestureEventRouting test is flaking in content_browsertests step of Linux ChromiumOS Tests.  From build 39795
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.chromiumos%2FLinux_ChromiumOS_Tests__1_%2F39795%2F%2B%2Frecipes%2Fsteps%2Fcontent_browsertests%2F0%2Fstdout

[1207/2018] SitePerProcessBrowserTest.InputEventRouterGestureTargetQueueTest (389 ms)
[ RUN      ] SitePerProcessBrowserTest.SubframeGestureEventRouting
Xlib:  extension "RANDR" missing on display ":99".
[15149:15149:0607/015512.960566:20378509222:ERROR:proxy_service.cc(1535)] ProxyConfigService for ChromeOS should be created in profile_io_data.cc::CreateProxyConfigService and this should be used only for examples.
[15149:15149:0607/015513.088309:20378636880:WARNING:render_frame_host_impl.cc(2522)] OnDidStopLoading was called twice.
[15149:15149:0607/015513.124843:20378673415:WARNING:render_frame_host_impl.cc(2522)] OnDidStopLoading was called twice.
../../content/browser/site_per_process_browsertest.cc:5913: Failure
      Expected: "1 click received"
To be equal to: result
      Which is: "0 clicks received"
[  FAILED  ] SitePerProcessBrowserTest.SubframeGestureEventRouting, where TypeParam =  and GetParam() =  (506 ms)
[1208/2018] SitePerProcessBrowserTest.SubframeGestureEventRouting (652 ms)

The frequency of the flake varies, but it seems to pass on retest, and hasn't caused the builder to go red.

Don't know if it's related, but the same test and failure was seen in Issue 592320.