Reviewed by Steve.

WebCore:
        <rdar://problem/5079175> Added parameters headerHeight and footerHeight to 
        computePageRectsForFrame() so we can account for the header and footer when
        calculating page heights for this frame.

        * bridge/win/FrameWin.cpp:
        (WebCore::computePageRectsForFrame):
        * bridge/win/FrameWin.h:
        
WebKit/win:
        <rdar://problem/5079175> Printing header and footer

        * Interfaces/IWebUIDelegate.idl: added methods for header/footer drawing.
        * WebFrame.cpp:
        (WebFrame::headerAndFooterHeights): ask client for the header and 
        footer heights via IWebUIDelegate2 methods.
        (WebFrame::computePageRects): pass in header and footer heights when
        calculating page rect heights.
        (WebFrame::spoolPages): ask client to draw header and footer via
        IWebUIDelegate2 methods.
        * WebFrame.h:
        * WebKitGraphics.cpp:
        (DrawTextAtPoint): the code assumes color has 4 components - might as well
        assert it.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@24826 268f45cc-cd09-0410-ab3c-d52691b4dbfc