2008-10-10  David Hyatt  <hyatt@apple.com>

        https://bugs.webkit.org/show_bug.cgi?id=21522

        Support increment/decrement/start/end on scrollbars.  Allows a fully functional scrollbar to be
        created.  (Just :hover/:active left to finish it up.)

        Reviewed by Adam Roben

        Added scrollbars/scrollbar-buttons.html

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::SelectorChecker::checkScrollbarPseudoClass):

LayoutTests:

2008-10-10  David Hyatt  <hyatt@apple.com>

        Add test for scrollbar buttons and track supporting increment/decrement/start/end.

        Reviewed by Adam Roben

        * platform/mac/scrollbars/scrollbar-buttons-expected.checksum: Added.
        * platform/mac/scrollbars/scrollbar-buttons-expected.png: Added.
        * platform/mac/scrollbars/scrollbar-buttons-expected.txt: Added.
        * scrollbars/scrollbar-buttons.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37482 268f45cc-cd09-0410-ab3c-d52691b4dbfc