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

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 6814c96b974c7e534a18b5ae7e3611e8e49e6477..6e881c0ab9faac23ab1a8f6664f2c86d85eee1e1 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -82,6 +82,7 @@
 #include "core/page/Page.h"
 #include "core/page/Settings.h"
 #include "core/platform/Partitions.h"
+#include "core/rendering/FlowThreadController.h"
 #include "core/rendering/RenderBox.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
@@ -1193,6 +1194,12 @@ bool Node::canStartSelection() const
     return parentOrShadowHostNode() ? parentOrShadowHostNode()->canStartSelection() : true;
 }
 
+bool Node::isRegisteredWithNamedFlow(const FlowThreadController* flowThreadController) const
+{
+    ASSERT(flowThreadController);
+    return flowThreadController->isContentNodeRegisteredWithAnyNamedFlow(this);

[esprehn, 2013/07/01 18:27:19]

Don't pass the flowThreadContorller in, just get it inside here.

document()->renderView()->flowThreadController()

+}
+
 Element* Node::shadowHost() const
 {
     if (ShadowRoot* root = containingShadowRoot())