[Webkit-unassigned] [Bug 249609] New: Rewrite wheel events tests for UI-side compositing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249609

            Bug ID: 249609
           Summary: Rewrite wheel events tests for UI-side compositing
           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: simon.fraser at apple.com

The following pattern is often used in scrolling tests:

            eventSender.monitorWheelEvents();
            await UIHelper.mouseWheelScrollAt(50, 50, 0, -10);
            await UIHelper.waitForScrollCompletion();

This doesn't work when UI-side compositing is enabled, because the UI process may not have committed a new layer/scrolling tree by the time that the first wheel event is handled in the UI process. This is because layer/scrolling tree updates happen via updateRendering() on a 60fps cadence, but `UIHelper.mouseWheelScrollAt` sends events via async IPC, which can get to the UI Process first.

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