https://bugs.webkit.org/show_bug.cgi?id=290365
<rdar://147804424>
Reviewed by Simon Fraser.
This can result in the paint dirty rect not intersecting with the document, if
the <iframe> is positioned.
* LayoutTests/performance-api/paint-timing/paint-timing-frames.html:
* Source/WebCore/rendering/ContentfulPaintChecker.cpp:
(WebCore::ContentfulPaintChecker::qualifiesForContentfulPaint):
Canonical link: https://commits.webkit.org/292679@main