Move painting code from RenderBoxModelObject into BoxPainter.

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 7fafa29ea302ac3326f9d2db3e4c2a0254b92f57..2a75ede12f628c4c36e8346f1ed3a1f6c7a8b6cb 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -40,6 +40,7 @@
 #include "core/page/AutoscrollController.h"
 #include "core/page/EventHandler.h"
 #include "core/page/Page.h"
+#include "core/paint/BackgroundImageGeometry.h"
 #include "core/paint/BoxPainter.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/PaintInfo.h"
@@ -1087,7 +1088,7 @@ void RenderBox::paintBoxDecorationBackground(PaintInfo& paintInfo, const LayoutP
 }
 
 
-bool RenderBox::getBackgroundPaintedExtent(LayoutRect& paintedExtent) const
+bool RenderBox::getBackgroundPaintedExtent(LayoutRect& paintedExtent)
 {
     ASSERT(hasBackground());
     LayoutRect backgroundRect = pixelSnappedIntRect(borderBoxRect());
@@ -1104,7 +1105,7 @@ bool RenderBox::getBackgroundPaintedExtent(LayoutRect& paintedExtent) const
     }
 
     BackgroundImageGeometry geometry;
-    calculateBackgroundImageGeometry(0, style()->backgroundLayers(), backgroundRect, geometry);
+    BoxPainter::calculateBackgroundImageGeometry(*this, 0, style()->backgroundLayers(), backgroundRect, geometry);
     if (geometry.hasNonLocalGeometry())
         return false;
     paintedExtent = geometry.destRect();