[webkit-changes] [WebKit/WebKit] 2cc096: compositing/updates/animation-non-composited.html ...

[Simon Fraser]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 2cc096e109bacf90ff156b0d186df2f056c349a2
      https://github.com/WebKit/WebKit/commit/2cc096e109bacf90ff156b0d186df2f056c349a2
  Author: Simon Fraser <simon.fraser at apple.com>
  Date:   2024-01-15 (Mon, 15 Jan 2024)

  Changed paths:
    M LayoutTests/compositing/updates/animation-non-composited.html

  Log Message:
  -----------
  compositing/updates/animation-non-composited.html is flaky
https://bugs.webkit.org/show_bug.cgi?id=267553
<rdar://problem/121011594>

Reviewed by Anne van Kesteren.

In this test, the setTimeout(0) races with the m_updateCompositingLayersTimer timer in
RenderLayerCompositor, which is scheduled via `RenderLayerCompositor::rootBackgroundColorOrTransparencyChanged()`
as a result of the background color changing. Because of this, we sometimes get a compositing update
count of 1.

So delay the start of the animation on a requestAnimationFrame().

* LayoutTests/compositing/updates/animation-non-composited.html:

Canonical link: https://commits.webkit.org/273052@main