[Webkit-unassigned] [Bug 184459] New: Layout Test legacy-animation-engine/animations/animation-callback-timestamp.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184459

            Bug ID: 184459
           Summary: Layout Test
                    legacy-animation-engine/animations/animation-callback-
                    timestamp.html is a flaky failure
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com
                CC: dino at apple.com

The following layout test is failing on macOS

legacy-animation-engine/animations/animation-callback-timestamp.html

Probable cause:

This test was added in https://trac.webkit.org/changeset/230471/webkit

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=legacy-animation-engine%2Fanimations%2Fanimation-callback-timestamp.html

--- /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/legacy-animation-engine/animations/animation-callback-timestamp-expected.txt
+++ /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/legacy-animation-engine/animations/animation-callback-timestamp-actual.txt
@@ -1,4 +1,6 @@
-PASS All the differences between requestAnimationFrame() callback timestamps and Performance.now() were within 3ms.
+requestAnimationFrame() timestamp = 235.00000000000003, window.performance.now() = 238.00000000000003
+requestAnimationFrame() timestamp = 486, window.performance.now() = 489
+FAIL Some of the requestAnimationFrame() callback timestamps were larger than Performance.now() by more than 3ms.
 PASS successfullyParsed is true

 TEST COMPLETE

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