Factor painting code out of RenderBox into a new class called BoxPainter.

Source/core/rendering/RenderTable.cpp

Index: Source/core/rendering/RenderTable.cpp
diff --git a/Source/core/rendering/RenderTable.cpp b/Source/core/rendering/RenderTable.cpp
index e898b39388d5d85afff9b84b00c13d4d2e778ed9..b4351f507b718c74625bd21a8a748be93238c723 100644
--- a/Source/core/rendering/RenderTable.cpp
+++ b/Source/core/rendering/RenderTable.cpp
@@ -65,6 +65,7 @@ RenderTable::RenderTable(Element* element)
     , m_vSpacing(0)
     , m_borderStart(0)
     , m_borderEnd(0)
+    , m_boxPainter(*this)
 {
     ASSERT(!childrenInline());
     m_columnPos.fill(0, 1);
@@ -709,7 +710,7 @@ void RenderTable::paintBoxDecorationBackground(PaintInfo& paintInfo, const Layou
 
     LayoutRect rect(paintOffset, size());
     subtractCaptionRect(rect);
-    paintBoxDecorationBackgroundWithRect(paintInfo, paintOffset, rect);
+    m_boxPainter.paintBoxDecorationBackgroundWithRect(paintInfo, paintOffset, rect);
 }
 
 void RenderTable::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
@@ -720,7 +721,7 @@ void RenderTable::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset
     LayoutRect rect(paintOffset, size());
     subtractCaptionRect(rect);
 
-    paintMaskImages(paintInfo, rect);
+    m_boxPainter.paintMaskImages(paintInfo, rect);
 }
 
 void RenderTable::computeIntrinsicLogicalWidths(LayoutUnit& minWidth, LayoutUnit& maxWidth) const