[Webkit-unassigned] [Bug 194179] Clarify layer nomenclature for the root scrolling layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194179

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
The "frame scrolling" layer (m_scrollLayer) can gain children for headers and footers, overhang areas, and content shadow.

So I think m_scrollLayer counts as the scrolled contents layer, but we don't ever set its size.

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