Use unified invalidation path for repaint-only style changes

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 32bd1854e7a4135157c87e4e99f5865a9054d493..943b93a9619737761dea2e9e0c7e14588f1c15ac 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -717,6 +717,8 @@ private:
 
     void savePreviousBorderBoxSizeIfNeeded();
 
+    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;