2008-10-13  David Hyatt  <hyatt@apple.com>

        Make RenderListBox work with CSS scrollbars.  Refactoring this code to support creation/destruction in
        the same way RenderLayer does also fixes a bug where the PLT would assert on the next-to-last page (no
        idea how to make a test case for that, though, since I couldn't repro without running the whole PLT).

        Reviewed by Tim Hatcher

        Added scrollbars/listbox-scrollbar-combinations.html

        * rendering/RenderListBox.cpp:
        (WebCore::RenderListBox::~RenderListBox):
        (WebCore::RenderListBox::updateFromElement):
        (WebCore::RenderListBox::createScrollbar):
        (WebCore::RenderListBox::destroyScrollbar):
        (WebCore::RenderListBox::setHasVerticalScrollbar):
        * rendering/RenderListBox.h:

LayoutTests:

2008-10-13  David Hyatt  <hyatt@apple.com>

        Add test case for custom CSS listbox scrollbars.

        Reviewed by Tim Hatcher

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



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37566 268f45cc-cd09-0410-ab3c-d52691b4dbfc