Fix for <rdar://problem/4472371> REGRESSION(417.9-TOT): Focus ring 
        around link in overflow:auto div isn't clipped to div

        Focus rings around the children off overflow:auto divs were not 
        being appropriately clipped because they were being painted with 
        the div's outlineRect, when they should be painted separately. This 
        patch adds two new PaintPhases -- PaintPhaseSelfOutline and 
        PaintPhaseChildOutlines -- to address this problem.

        This patch also changes the name of PaintAction back to PaintPhase. 
        Because Hyatt said so.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@13592 268f45cc-cd09-0410-ab3c-d52691b4dbfc