Explore the possibility of implementing the CSS Region interface.

Source/core/dom/NamedFlow.cpp

Index: Source/core/dom/NamedFlow.cpp
diff --git a/Source/core/dom/NamedFlow.cpp b/Source/core/dom/NamedFlow.cpp
index 4f4d2044d32a3aa2a2dd88d1a37c8872ae99bfdf..a6265fca46d01382a27d2903c3d68b292b69f5ae 100644
--- a/Source/core/dom/NamedFlow.cpp
+++ b/Source/core/dom/NamedFlow.cpp
@@ -31,7 +31,9 @@
 #include "core/dom/NamedFlow.h"
 
 #include "RuntimeEnabledFeatures.h"
+#include "core/css/CSSRegion.h"
 #include "core/dom/NamedFlowCollection.h"
+#include "core/dom/Range.h"
 #include "core/dom/StaticNodeList.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/events/UIEvent.h"
@@ -117,12 +119,12 @@ int NamedFlow::firstEmptyRegionIndex() const
     return -1;
 }
 
-PassRefPtr<NodeList> NamedFlow::getRegionsByContent(Node* contentNode)
+Vector<const RenderRegion*> NamedFlow::getRegionsByContent(Node* contentNode)
 {
-    Vector<RefPtr<Node> > regionNodes;
+    Vector<const RenderRegion*> regionObjects;
 
     if (!contentNode)
-        return StaticNodeList::adopt(regionNodes);
+        return regionObjects;
 
     if (m_flowManager->document())
         m_flowManager->document()->updateLayoutIgnorePendingStylesheets();
@@ -130,27 +132,23 @@ PassRefPtr<NodeList> NamedFlow::getRegionsByContent(Node* contentNode)
     // The renderer may be destroyed or created after the style update.
     // Because this is called from JS, where the wrapper keeps a reference to the NamedFlow, no guard is necessary.
     if (!m_parentFlowThread)
-        return StaticNodeList::adopt(regionNodes);
+        return regionObjects;
 
     if (inFlowThread(contentNode->renderer(), m_parentFlowThread)) {
         const RenderRegionList& regionList = m_parentFlowThread->renderRegionList();
         for (RenderRegionList::const_iterator iter = regionList.begin(); iter != regionList.end(); ++iter) {
             const RenderRegion* renderRegion = *iter;
-            // They will be included when we will properly support the Region interface
-            // http://dev.w3.org/csswg/css-regions/#the-region-interface
-            if (renderRegion->isPseudoElement())
-                continue;
             if (m_parentFlowThread->objectInFlowRegion(contentNode->renderer(), renderRegion))
-                regionNodes.append(renderRegion->node());
+                regionObjects.append(renderRegion);
         }
     }
 
-    return StaticNodeList::adopt(regionNodes);
+    return regionObjects;
 }
 
-PassRefPtr<NodeList> NamedFlow::getRegions()
+Vector<const RenderRegion*> NamedFlow::getRegions()
 {
-    Vector<RefPtr<Node> > regionNodes;
+    Vector<const RenderRegion*> regionObjects;
 
     if (m_flowManager->document())
         m_flowManager->document()->updateLayoutIgnorePendingStylesheets();
@@ -158,19 +156,15 @@ PassRefPtr<NodeList> NamedFlow::getRegions()
     // The renderer may be destroyed or created after the style update.
     // Because this is called from JS, where the wrapper keeps a reference to the NamedFlow, no guard is necessary.
     if (!m_parentFlowThread)
-        return StaticNodeList::adopt(regionNodes);
+        return regionObjects;
 
     const RenderRegionList& regionList = m_parentFlowThread->renderRegionList();
     for (RenderRegionList::const_iterator iter = regionList.begin(); iter != regionList.end(); ++iter) {
         const RenderRegion* renderRegion = *iter;
-        // They will be included when we will properly support the Region interface
-        // http://dev.w3.org/csswg/css-regions/#the-region-interface
-        if (renderRegion->isPseudoElement())
-            continue;
-        regionNodes.append(renderRegion->node());
+        regionObjects.append(renderRegion);
     }
 
-    return StaticNodeList::adopt(regionNodes);
+    return regionObjects;
 }
 
 PassRefPtr<NodeList> NamedFlow::getContent()