[webkit-reviews] review requested: [Bug 57202] Allow setting composited backing stores for scrollbars and scroll corners : [Attachment 88101] only create layers for overlay scrollbars on mac

[bugzilla-daemon at webkit.org]

James Robinson <jamesr at chromium.org> has asked	for review:
Bug 57202: Allow setting composited backing stores for scrollbars and scroll
corners
https://bugs.webkit.org/show_bug.cgi?id=57202

Attachment 88101: only create layers for overlay scrollbars on mac
https://bugs.webkit.org/attachment.cgi?id=88101&action=review