Bug 146927

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

Description Simon Fraser (smfr) 2015-07-13 22:16:31 PDT

We're really confused about scrollOffset/scrollPosition/scrollOrigin.

Need to use consistent terms, possibly make it strongly typed. Need to decide on IntPoint/FloatPoint/LayoutPoint for units.

Some code to clean up:
* Move ScrollView::adjustScrollPositionWithinRange() into ScrollableArea, use it in ScrollAnimatorMac::adjustScrollPositionIfNecessary().
* Use it in ScrollView::setScrollOffset()