Move painting code from RenderGrid to GridPainter.

Source/core/rendering/RenderGrid.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 34 matching lines @@
 
     virtual void layoutBlock(bool relayoutChildren) OVERRIDE;
 
     virtual bool canCollapseAnonymousBlockChild() const OVERRIDE { return false; }
 
     void dirtyGrid();
 
     const Vector<LayoutUnit>& columnPositions() const { return m_columnPositions; }
     const Vector<LayoutUnit>& rowPositions() const { return m_rowPositions; }
 
+    typedef Vector<RenderBox*, 1> GridCell;
+    const GridCell& gridCell(int row, int column) { return m_grid[row][column]; }
+    const Vector<RenderBox*>& itemsOverflowingGridArea() { return m_gridItemsOverflowingGridArea; }
+    int paintIndexForGridItem(const RenderBox* renderBox) { return m_gridItemsIndexesMap.get(renderBox); }
+
+    bool gridIsDirty() const { return m_gridIsDirty; }
+
 private:
     virtual bool isRenderGrid() const OVERRIDE { return true; }
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
     virtual void computePreferredLogicalWidths() OVERRIDE;
 
     virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE;
     void addChildToIndexesMap(RenderBox&);
     virtual void removeChild(RenderObject*) OVERRIDE;
 
     virtual void styleDidChange(StyleDifference, const RenderStyle*) OVERRIDE;
@@ skipping 50 matching lines @@
     LayoutUnit centeredRowPositionForChild(const RenderBox&) const;
     LayoutUnit rowPositionForChild(const RenderBox&) const;
     LayoutPoint findChildLogicalPosition(const RenderBox&) const;
     GridCoordinate cachedGridCoordinate(const RenderBox&) const;
 
     LayoutUnit gridAreaBreadthForChild(const RenderBox& child, GridTrackSizingDirection, const Vector<GridTrack>&) const;
 
     virtual void paintChildren(PaintInfo&, const LayoutPoint&) OVERRIDE;
     void paintChild(RenderBox*, PaintInfo&, const LayoutPoint&);
 
-    bool gridIsDirty() const { return m_gridIsDirty; }
-
 #if ENABLE(ASSERT)
     bool tracksAreWiderThanMinTrackBreadth(GridTrackSizingDirection, const Vector<GridTrack>&);
 #endif
 
     size_t gridItemSpan(const RenderBox&, GridTrackSizingDirection);
 
     size_t gridColumnCount() const
     {
         ASSERT(!gridIsDirty());
         return m_grid[0].size();
     }
     size_t gridRowCount() const
     {
         ASSERT(!gridIsDirty());
         return m_grid.size();
     }
 
-    typedef Vector<RenderBox*, 1> GridCell;
     typedef Vector<Vector<GridCell> > GridRepresentation;
     GridRepresentation m_grid;
     bool m_gridIsDirty;
     Vector<LayoutUnit> m_rowPositions;
     Vector<LayoutUnit> m_columnPositions;
     HashMap<const RenderBox*, GridCoordinate> m_gridItemCoordinate;
     OrderIterator m_orderIterator;
     Vector<RenderBox*> m_gridItemsOverflowingGridArea;
     HashMap<const RenderBox*, size_t> m_gridItemsIndexesMap;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderGrid, isRenderGrid());
 
 } // namespace blink
 
 #endif // RenderGrid_h