Add BorderBoxOutsets method to LayoutBoxModelObject

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/BoxPainter.h"
 
 #include "core/HTMLNames.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/layout/ImageQualityController.h"
@@ skipping 59 matching lines @@
     // For the case where we are painting the background into the scrolling
     // contents layer of a composited scroller we need to include the entire
     // overflow rect.
     paint_rect = layout_box_.LayoutOverflowRect();
     scroll_recorder.emplace(paint_info.context, layout_box_, paint_info.phase,
                             layout_box_.ScrolledContentOffset());
 
     // 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();
   }
 
   paint_rect.MoveBy(paint_offset);
   PaintBoxDecorationBackgroundWithRect(paint_info, paint_offset, paint_rect);
 }
 
 LayoutRect BoxPainter::BoundsForDrawingRecorder(
     const PaintInfo& paint_info,
@@ skipping 776 matching lines @@
   if (PaintNinePieceImage(obj, info.context, rect, style, style.BorderImage()))
     return;
 
   const BoxBorderPainter border_painter(rect, style, bleed_avoidance,
                                         include_logical_left_edge,
                                         include_logical_right_edge);
   border_painter.PaintBorder(info, rect);
 }
 
 }  // namespace blink