Introduce infrastructure for tracing ScriptWrappables.

third_party/WebKit/Source/core/dom/NodeRareData.cpp

Index: third_party/WebKit/Source/core/dom/NodeRareData.cpp
diff --git a/third_party/WebKit/Source/core/dom/NodeRareData.cpp b/third_party/WebKit/Source/core/dom/NodeRareData.cpp
index 04a158e212d49c2fbd61588b1f570da86e2cac47..d586bf541e72e0c5747cfecf420949a04f4bdcd3 100644
--- a/third_party/WebKit/Source/core/dom/NodeRareData.cpp
+++ b/third_party/WebKit/Source/core/dom/NodeRareData.cpp
@@ -30,6 +30,7 @@
 
 #include "core/dom/NodeRareData.h"
 
+#include "bindings/core/v8/ScriptWrappableVisitor.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementRareData.h"
 #include "core/frame/FrameHost.h"
@@ -64,6 +65,11 @@ DEFINE_TRACE(NodeRareData)
         traceAfterDispatch(visitor);
 }
 
+DEFINE_TRACE_WRAPPABLE(NodeRareData);
+DEFINE_TRACE_WRAPPABLE_CHILDREN(NodeRareData)
+{
+}
+
 void NodeRareData::finalizeGarbageCollectedObject()
 {
     RELEASE_ASSERT(!layoutObject());