Refactor repainting logic to abstract away the specific repaint container.

Source/core/rendering/RenderLayerRepainter.h

Index: Source/core/rendering/RenderLayerRepainter.h
diff --git a/Source/core/rendering/RenderLayerRepainter.h b/Source/core/rendering/RenderLayerRepainter.h
index 7df0b18a42ab8c7c118ae6968f4c6018b658aca7..092fe0939a8363742370e3b0566fffb2918df851 100644
--- a/Source/core/rendering/RenderLayerRepainter.h
+++ b/Source/core/rendering/RenderLayerRepainter.h
@@ -70,11 +70,11 @@ public:
     LayoutRect repaintRectIncludingNonCompositingDescendants() const;
 
     void repaintAfterLayout(bool shouldCheckForRepaint);
-    void repaintIncludingNonCompositingDescendants(const RenderLayerModelObject* repaintContainer);
+    void repaintIncludingNonCompositingDescendants();
 
     void setRepaintStatus(RepaintStatus status) { m_repaintStatus = status; }
 
-    void computeRepaintRects(const RenderLayerModelObject* repaintContainer);
+    void computeRepaintRects();
     void computeRepaintRectsIncludingDescendants();
 
     // Indicate that the layer contents need to be repainted. Only has an effect
@@ -85,6 +85,8 @@ public:
     void setFilterBackendNeedsRepaintingInRect(const LayoutRect&);
 
 private:
+    void repaintIncludingNonCompositingDescendantsInternal(const RenderLayerModelObject* repaintContainer);
+
     bool shouldRepaintLayer() const;
 
     void clearRepaintRects();