Factor painting code from RenderBlock into BlockPainter.

Source/core/rendering/RenderGrid.cpp

Index: Source/core/rendering/RenderGrid.cpp
diff --git a/Source/core/rendering/RenderGrid.cpp b/Source/core/rendering/RenderGrid.cpp
index e6bc86d42a3502e20ecf1c9bac2ec7ec3b87aeaf..c68a38e806b46ec32173c3d9a6a4f32e92080af7 100644
--- a/Source/core/rendering/RenderGrid.cpp
+++ b/Source/core/rendering/RenderGrid.cpp
@@ -1448,6 +1448,13 @@ void RenderGrid::paintChildren(PaintInfo& paintInfo, const LayoutPoint& paintOff
     }
 }
 
+void RenderGrid::paintChild(RenderBox* child, PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    LayoutPoint childPoint = flipForWritingModeForChild(child, paintOffset);
+    if (!child->hasSelfPaintingLayer() && !child->isFloating())
+        child->paint(paintInfo, childPoint);
+}
+
 const char* RenderGrid::renderName() const
 {
     if (isFloating())