Add BorderBoxOutsets method to LayoutBoxModelObject

third_party/WebKit/Source/core/paint/BoxPainter.cpp

Index: third_party/WebKit/Source/core/paint/BoxPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxPainter.cpp b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
index 3b15cff3cac6aa518db6ce968dffac54d344bb9a..06016f14727821750f5ba9e6d14f0c6ebfa0ba5e 100644
--- a/third_party/WebKit/Source/core/paint/BoxPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
@@ -77,9 +77,7 @@ void BoxPainter::PaintBoxDecorationBackground(const PaintInfo& paint_info,
     // The background painting code assumes that the borders are part of the
     // paintRect so we expand the paintRect by the border size when painting the
     // background into the scrolling contents layer.
-    paint_rect.ExpandEdges(layout_box_.BorderTop(), layout_box_.BorderRight(),
-                           layout_box_.BorderBottom(),
-                           layout_box_.BorderLeft());
+    paint_rect.Expand(layout_box_.BorderBoxOutsets());
   } else {
     paint_rect = layout_box_.BorderBoxRect();
   }