Bug 144422

Summary:	Clean up ScrollingCoordinator::absoluteNonFastScrollableRegionForFrame()
Product:	WebKit	Reporter:	Simon Fraser (smfr) <simon.fraser>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal
Priority:	P2
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified

Description Simon Fraser (smfr) 2015-04-29 17:31:29 PDT

We should avoid recursing into subframes if we've already accounted for them as scrollable areas.
We could clip regions for subframes.
We should handled transformed frames better (but we'd have to be able to map regions through transforms).