[CSS Regions] Elements in a region should be assignable to a named flow

Source/core/rendering/RenderRegion.h

Index: Source/core/rendering/RenderRegion.h
diff --git a/Source/core/rendering/RenderRegion.h b/Source/core/rendering/RenderRegion.h
index a4a7238e05a47bf948d45a451c08e3cb13e11688..cc077516fbd6874789435b646bb5d8c54a37e62f 100644
--- a/Source/core/rendering/RenderRegion.h
+++ b/Source/core/rendering/RenderRegion.h
@@ -145,6 +145,7 @@ private:
     virtual const char* renderName() const { return "RenderRegion"; }
 
     virtual bool canHaveChildren() const OVERRIDE { return false; }
+    virtual bool canDOMChildrenHaveRenderParent() const OVERRIDE { return true; }
 
     virtual void insertedIntoTree() OVERRIDE;
     virtual void willBeRemovedFromTree() OVERRIDE;