[Webkit-unassigned] [Bug 196218] New: [ iOS Sim] Layout Test performance-api/performance-observer-periodic.html is flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196218

            Bug ID: 196218
           Summary: [ iOS Sim] Layout Test
                    performance-api/performance-observer-periodic.html is
                    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

Test is now a flaky failure on iOS 12 Simulator

Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=performance-api%2Fperformance-observer-periodic.html

First appearance was around r243337 but I was able to reproduce it with r242010 so it appears it's been flaky for as long as the other platforms. Gets about 1 failure in 1000 iterations, highly flaky. 

Test has been marked as flaky for Mac OS in previous bugs. Will link those as well.

Reproducible with :

run-webkit-tests performance-api/performance-observer-periodic.html --ios-simulator --iterations 1000 -f

--- /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/performance-api/performance-observer-periodic-expected.txt
+++ /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/performance-api/performance-observer-periodic-actual.txt
@@ -5,9 +5,6 @@

 PerformanceObserver callback fired: 1 entries
 PASS mark1
-PerformanceObserver callback fired: 2 entries
-PASS mark2
-PASS mark3
 PerformanceObserver callback fired: 1 entries
 PASS mark7
 PASS successfullyParsed is true

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