https://bugs.webkit.org/show_bug.cgi?id=21527

        Make CSS scrollbars support :not, :hover and :active.

        Reviewed by Adam Roben

        Added WebCore/manual-tests/scrollbar-hover-active.html

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::SelectorChecker::checkOneSelector):
        (WebCore::CSSStyleSelector::SelectorChecker::checkScrollbarPseudoClass):
        * platform/Scrollbar.cpp:
        (WebCore::Scrollbar::autoscrollPressedPart):
        (WebCore::Scrollbar::startTimerIfNeeded):
        (WebCore::Scrollbar::setHoveredPart):
        (WebCore::Scrollbar::setPressedPart):
        (WebCore::Scrollbar::mouseMoved):
        (WebCore::Scrollbar::mouseExited):
        (WebCore::Scrollbar::mouseUp):
        (WebCore::Scrollbar::mouseDown):
        * platform/Scrollbar.h:
        * rendering/RenderScrollbar.cpp:
        (WebCore::RenderScrollbar::setHoveredPart):
        (WebCore::RenderScrollbar::setPressedPart):
        (WebCore::RenderScrollbar::updateScrollbarParts):
        (WebCore::pseudoForScrollbarPart):
        (WebCore::RenderScrollbar::updateScrollbarPart):
        * rendering/RenderScrollbar.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37486 268f45cc-cd09-0410-ab3c-d52691b4dbfc