NEW 145189
Investigate removing mutex from ScrollingTree 
https://bugs.webkit.org/show_bug.cgi?id=145189
Summary Investigate removing mutex from ScrollingTree
Brent Fulgham
Reported 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.
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