Make LayoutBoxModelObject const when passed to calculateBackgroundImageGeometry

Source/core/paint/BoxPainter.cpp

Index: Source/core/paint/BoxPainter.cpp
diff --git a/Source/core/paint/BoxPainter.cpp b/Source/core/paint/BoxPainter.cpp
index 54efc4195fc86b688a74f6836b1cd66eb379ae01..0c3b874d733b53aa2b16308991b93d0461487fdb 100644
--- a/Source/core/paint/BoxPainter.cpp
+++ b/Source/core/paint/BoxPainter.cpp
@@ -584,7 +584,7 @@ static inline int getSpaceBetweenImageTiles(int areaSize, int tileSize)
     return space;
 }
 
-void BoxPainter::calculateBackgroundImageGeometry(LayoutBoxModelObject& obj, const LayoutBoxModelObject* paintContainer, const GlobalPaintFlags globalPaintFlags, const FillLayer& fillLayer, const LayoutRect& paintRect,
+void BoxPainter::calculateBackgroundImageGeometry(const LayoutBoxModelObject& obj, const LayoutBoxModelObject* paintContainer, const GlobalPaintFlags globalPaintFlags, const FillLayer& fillLayer, const LayoutRect& paintRect,
     BackgroundImageGeometry& geometry, LayoutObject* backgroundObject)
 {
     LayoutUnit left = 0;