[Webkit-unassigned] [Bug 196470] New: [ Mojave WK1 ] Layout Test media/track/track* is a flaky failure

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https://bugs.webkit.org/show_bug.cgi?id=196470

            Bug ID: 196470
           Summary: [ Mojave WK1 ] Layout Test media/track/track* is a
                    flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mojave WK1 Release and Debug

media/track/track-css-visible-stroke.html
media/track/track-cue-left-align.html
media/track/track-cue-line-position.html

Probable cause:

Unsure of point of regression. The 3 tests above fail in tandem on both queues. I have tried reproducing it by testing each test locally, and using the test runners from those runs and I cannot get them to fail. 

Looking at the stdio log, media/track/track-css-visible-stroke.html fails first with a reference mismatch, then the other two fail with failed unexpectedly (reference mismatch didn't happen)

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=media%2Ftrack%2Ftrack-css-visible-stroke.html%20media%2Ftrack%2Ftrack-cue-left-align.html%20media%2Ftrack%2Ftrack-cue-line-position.html

Diff for media/track/track-css-visible-stroke.html:

https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r243707%20(4088)/media/track/track-css-visible-stroke-diff.png

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