Bug 145189

Summary:	Investigate removing mutex from ScrollingTree
Product:	WebKit	Reporter:	Brent Fulgham <bfulgham>
Component:	Layout and Rendering	Assignee:	Brent Fulgham <bfulgham>
Status:	NEW ---
Severity:	Normal	CC:	bdakin, bfulgham, sam, simon.fraser
Priority:	P2
Version:	528+ (Nightly build)
Hardware:	All
OS:	All

Description Brent Fulgham 2015-05-19 15:36:57 PDT

The "setMainFrameIsRubberBanding/isRubberBandInProgress" and "setMainFrameIsScrollSnapping/isScrollSnapInProgress" use a mutex to coordinate main thread/scrolling thread communications.

Instead, we should have these values copied to the scrolling thread on the scroll state node tree, and have any updates messages back from the scrolling thread, as we do for other values.