https://bugs.webkit.org/show_bug.cgi?id=69373

Reviewed by David Hyatt.

ScrollElasticityController is a new class that will handle the rubber-banding when handling scroll events.

* WebCore.xcodeproj/project.pbxproj:
* platform/mac/ScrollAnimatorMac.h:
* platform/mac/ScrollAnimatorMac.mm:
(WebCore::ScrollAnimatorMac::ScrollAnimatorMac):
(WebCore::ScrollAnimatorMac::handleWheelEvent):
(WebCore::ScrollAnimatorMac::smoothScrollWithEvent):
(WebCore::ScrollAnimatorMac::beginScrollGesture):
(WebCore::ScrollAnimatorMac::snapRubberBand):
(WebCore::ScrollAnimatorMac::snapRubberBandTimerFired):
* platform/mac/ScrollElasticityController.h: Added.
(WebCore::ScrollElasticityControllerClient::~ScrollElasticityControllerClient):
* platform/mac/ScrollElasticityController.mm: Added.
(WebCore::ScrollElasticityController::ScrollElasticityController):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96644 268f45cc-cd09-0410-ab3c-d52691b4dbfc