Push selection gaps logic down to RenderBlockFlow

Source/core/paint/BlockFlowPainter.h

Index: Source/core/paint/BlockFlowPainter.h
diff --git a/Source/core/paint/BlockFlowPainter.h b/Source/core/paint/BlockFlowPainter.h
index e02c3c59fc0dd3f5fdcc1db44ccf5b45114ac13a..4a8b76c766457cebf726770edac0e1cb114a292a 100644
--- a/Source/core/paint/BlockFlowPainter.h
+++ b/Source/core/paint/BlockFlowPainter.h
@@ -15,7 +15,7 @@ class BlockFlowPainter {
 public:
     BlockFlowPainter(RenderBlockFlow& renderBlockFlow) : m_renderBlockFlow(renderBlockFlow) { }
     void paintFloats(PaintInfo&, const LayoutPoint&, bool preservePhase);
-
+    void paintSelection(PaintInfo&, const LayoutPoint&);
 private:
     RenderBlockFlow& m_renderBlockFlow;
 };