[New Multicolumn] Faster and more direct RenderMultiColumnSet::multiColumnFlowThread().

Source/core/rendering/RenderMultiColumnFlowThread.h

Index: Source/core/rendering/RenderMultiColumnFlowThread.h
diff --git a/Source/core/rendering/RenderMultiColumnFlowThread.h b/Source/core/rendering/RenderMultiColumnFlowThread.h
index 639c9b513baa4bf2a5a1a6197027c7b7e714fff9..3a2d865e77c5c3b152867896d6bdfda95c5ee583 100644
--- a/Source/core/rendering/RenderMultiColumnFlowThread.h
+++ b/Source/core/rendering/RenderMultiColumnFlowThread.h
@@ -56,6 +56,11 @@ public:
 
     static RenderMultiColumnFlowThread* createAnonymous(Document&, RenderStyle* parentStyle);
 
+#ifndef NDEBUG
+    // This one is only used in assertions at the moment.

[rune, 2014/04/30 11:00:12]

"one" -> "method"?

[mstensho (USE GERRIT), 2014/04/30 11:05:06]

Done.

+    virtual bool isRenderMultiColumnFlowThread() const OVERRIDE FINAL { return true; }
+#endif // NDEBUG
+
     RenderBlockFlow* multiColumnBlockFlow() const { return toRenderBlockFlow(parent()); }
 
     RenderMultiColumnSet* firstMultiColumnSet() const;