[Webkit-unassigned] [Bug 215515] New: [ macOS iOS ] imported/w3c/web-platform-tests/user-timing/measure_navigation_timing.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215515

            Bug ID: 215515
           Summary: [ macOS iOS ]
                    imported/w3c/web-platform-tests/user-timing/measure_na
                    vigation_timing.html is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hector_i_lopez at apple.com

imported/w3c/web-platform-tests/user-timing/measure_navigation_timing.html

Test is a flaky failure for macOS and iOS according to history. First occurrence of failure on iOS is at r259150 and on macOS at r252370.

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fuser-timing%2Fmeasure_navigation_timing.html&platform=ios&platform=mac&limit=50000

Diff:
--- /Volumes/Data/slave/ios-simulator-13-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/user-timing/measure_navigation_timing-expected.txt
+++ /Volumes/Data/slave/ios-simulator-13-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/user-timing/measure_navigation_timing-actual.txt
@@ -12,7 +12,7 @@
 PASS window.performance.getEntriesByName("measure_nav_start_no_end")[0].name == "measure_nav_start_no_end" 
 PASS window.performance.getEntriesByName("measure_nav_start_no_end")[0].startTime is correct 
 PASS window.performance.getEntriesByName("measure_nav_start_no_end")[0].entryType == "measure" 
-PASS window.performance.getEntriesByName("measure_nav_start_no_end")[0].duration is approximately correct (up to 20ms difference allowed) 
+FAIL window.performance.getEntriesByName("measure_nav_start_no_end")[0].duration is approximately correct (up to 20ms difference allowed) assert_true: window.performance.getEntriesByName("measure_nav_start_no_end")[0].duration is approximately correct (up to 20ms difference allowed) expected true got false
 PASS window.performance.getEntriesByName("measure_nav_start_mark_end")[0].name == "measure_nav_start_mark_end" 
 PASS window.performance.getEntriesByName("measure_nav_start_mark_end")[0].startTime is correct 
 PASS window.performance.getEntriesByName("measure_nav_start_mark_end")[0].entryType == "measure"

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