[ macOS ] webanimations/accelerated-animation-after-forward-filling-a…

…nimation.html is a flaky image failure

https://bugs.webkit.org/show_bug.cgi?id=239794
<rdar://92365628>

Patch by Antoine Quint <graouts@apple.com> on 2022-06-13
Reviewed by Dean Jackson.

Typically we wait 3 frames before considering an accelerated animation was committed.
Additionally, locally I could reproduce the issue prior to this patch but not with it.

* LayoutTests/platform/mac/TestExpectations:
* LayoutTests/webanimations/accelerated-animation-after-forward-filling-animation.html:

Canonical link: https://commits.webkit.org/251500@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295495 268f45cc-cd09-0410-ab3c-d52691b4dbfc

LayoutTests/platform/mac/TestExpectations

@@ -2289,8 +2289,6 @@ editing/execCommand/insert-ordered-list-and-delete.html [ Pass Failure ]
 
 webkit.org/b/239791 webanimations/accelerated-animation-slot-invalidation.html [ Pass ImageOnlyFailure ]
 
-webkit.org/b/239794 webanimations/accelerated-animation-after-forward-filling-animation.html [ Pass ImageOnlyFailure ]
-
 webkit.org/b/239990 css3/calc/transitions-dependent.html [ Pass Failure ]
 
 webkit.org/b/240074 imported/w3c/web-platform-tests/service-workers/service-worker/registration-updateviacache.https.html [ Pass Failure ]

LayoutTests/webanimations/accelerated-animation-after-forward-filling-animation.html

@@ -32,6 +32,7 @@
     await animation.ready;
     await new Promise(requestAnimationFrame);
     await new Promise(requestAnimationFrame);
+    await new Promise(requestAnimationFrame);
 
     if (window.testRunner)
         window.testRunner.notifyDone();