WIP: Skeleton for paint offset caching

Source/core/paint/ObjectPainter.h

Index: Source/core/paint/ObjectPainter.h
diff --git a/Source/core/paint/ObjectPainter.h b/Source/core/paint/ObjectPainter.h
index 555e3161f2ac7e0cac960b9949b1669a5f605636..72e3d62adca65ea4d5c21d348860b999478d4fba 100644
--- a/Source/core/paint/ObjectPainter.h
+++ b/Source/core/paint/ObjectPainter.h
@@ -22,7 +22,8 @@ class ObjectPainter {
 public:
     ObjectPainter(LayoutObject& layoutObject) : m_layoutObject(layoutObject) { }
 
-    void paintOutline(const PaintInfo&, const LayoutRect& objectBounds, const LayoutRect& visualOverflowBounds);
+    // TODO(pdr): Update paintOutline to take a visualOverflowRect and a paintOffset and update the visual overflow in this function instead of at callsites.
+    void paintOutline(const PaintInfo&, const LayoutRect& objectBounds, const LayoutRect& visualOverflowBounds, const LayoutPoint& paintOffset);
     void paintFocusRing(const PaintInfo&, const ComputedStyle&, const Vector<LayoutRect>& focusRingRects);
     void addPDFURLRectIfNeeded(const PaintInfo&, const LayoutPoint& paintOffset);