Add RegisterExternallyReferencedObject to PersistenValueMap

include/v8-util.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_UTIL_H_
 #define V8_UTIL_H_
 
 #include "v8.h"  // NOLINT(build/include)
 #include <map>
 #include <vector>
@@ skipping 188 matching lines @@
    * Call Isolate::SetReference with the given parent and the map value.
    */
   void SetReference(const K& key,
       const Persistent<Object>& parent) {
     GetIsolate()->SetReference(
       reinterpret_cast<internal::Object**>(parent.val_),
       reinterpret_cast<internal::Object**>(FromVal(Traits::Get(&impl_, key))));
   }
 
   /**
+   * Call V8::RegisterExternallyReferencedObject with the map value for given
+   * key.
+   */
+  void RegisterExternallyReferencedObject(K& key) {
+    DCHECK(Contains(key));
+    V8::RegisterExternallyReferencedObject(
+        reinterpret_cast<internal::Object**>(FromVal(Traits::Get(&impl_, key))),
+        reinterpret_cast<internal::Isolate*>(GetIsolate()));
+  }
+
+  /**
    * Return value for key and remove it from the map.
    */
   Global<V> Remove(const K& key) {
     return Release(Traits::Remove(&impl_, key)).Pass();
   }
 
   /**
   * Traverses the map repeatedly,
   * in case side effects of disposal cause insertions.
   **/
@@ skipping 415 matching lines @@
     return reinterpret_cast<V*>(v);
   }
 
   Isolate* isolate_;
   typename Traits::Impl impl_;
 };
 
 }  // namespace v8
 
 #endif  // V8_UTIL_H