Extract RenderBox::invalidatePaintIfNeeded()

Source/core/rendering/RenderBox.h

Index: Source/core/rendering/RenderBox.h
diff --git a/Source/core/rendering/RenderBox.h b/Source/core/rendering/RenderBox.h
index a3c8529641b763655c5a4490b143803a669fa7bd..4b1f3fde8b1f24f837d5838e24bb9df1e9f17315 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -718,6 +718,8 @@ private:
     void savePreviousBorderBoxSizeIfNeeded();
     bool logicalHeightComputesAsNone(SizeType) const;
 
+    void invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject& newPaintInvalidationContainer);
+
 private:
     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
     LayoutRect m_frameRect;