[webkit-reviews] review requested: [Bug 74111] Some overlay scrollbar API calls in ScrollAnimatorMac can lead to an assertion in RenderBox::mapAbsoluteToLocalPoint : [Attachment 144815] Fix + manual test that asserts

[bugzilla-daemon at webkit.org]

Ion Rosca <rosca at adobe.com> has asked  for review:
Bug 74111: Some overlay scrollbar API calls in ScrollAnimatorMac can lead to an
assertion in RenderBox::mapAbsoluteToLocalPoint
https://bugs.webkit.org/show_bug.cgi?id=74111

Attachment 144815: Fix + manual test that asserts
https://bugs.webkit.org/attachment.cgi?id=144815&action=review

------- Additional Comments from Ion Rosca <rosca at adobe.com>
I've moved notifyPositionChanged to a zero-delay timer as Beth has suggested.
This assert cannot be fired when running layout tests, however	the html I
added as manual test should crash at load time on a debug lion build.