Explore the possibility of implementing the CSS Region interface.

Source/core/dom/NamedFlow.h

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
@@ skipping 25 matching lines @@
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 class Document;
 class NamedFlowCollection;
 class Node;
 class NodeList;
 class RenderNamedFlowThread;
+class RenderRegion;

[abarth-chromium, 2013/11/14 07:55:15]

These seem like bad dependencies.  The DOM shouldn't really have any direct
dependencies on the render tree, but that's a topic for another day.

[abucur, 2013/11/15 07:15:14]

I had in mind creating a DOM equivalent for region a while back but I didn't get
the chance. Maybe it's something we should do before exposing the Region
interface.

 class ExecutionContext;
 
 class NamedFlow : public RefCounted<NamedFlow>, public ScriptWrappable, public EventTargetWithInlineData {
     REFCOUNTED_EVENT_TARGET(NamedFlow);
 public:
     static PassRefPtr<NamedFlow> create(PassRefPtr<NamedFlowCollection> manager, const AtomicString& flowThreadName);
 
     ~NamedFlow();
 
     const AtomicString& name() const;
     bool overset() const;
     int firstEmptyRegionIndex() const;
-    PassRefPtr<NodeList> getRegionsByContent(Node*);
-    PassRefPtr<NodeList> getRegions();
+    Vector<const RenderRegion*> getRegionsByContent(Node*);
+    Vector<const RenderRegion*> getRegions();
     PassRefPtr<NodeList> getContent();
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ExecutionContext* executionContext() const OVERRIDE;
 
     // This function is called from the JS binding code to determine if the NamedFlow object is reachable or not.
     // If the object has listeners, the object should only be discarded if the parent Document is not reachable.
     Node* ownerNode() const;
 
     void setRenderer(RenderNamedFlowThread* parentFlowThread);
@@ skipping 14 matching lines @@
     // The name of the flow thread as specified in CSS.
     AtomicString m_flowThreadName;
 
     RefPtr<NamedFlowCollection> m_flowManager;
     RenderNamedFlowThread* m_parentFlowThread;
 };
 
 }
 
 #endif