Add an interface for an embedder to provide information about native

src/global-handles.h

Index: src/global-handles.h
diff --git a/src/global-handles.h b/src/global-handles.h
index 37b2b44522e55ea628a433f8546b5a5fd6e8da74..3bab4b8c0ac5e7fa973b4c22ebd2e303bfbbda60 100644
--- a/src/global-handles.h
+++ b/src/global-handles.h
@@ -48,10 +48,16 @@ namespace internal {
 class ObjectGroup : public Malloced {
  public:
   ObjectGroup() : objects_(4) {}
-  explicit ObjectGroup(size_t capacity)
-      : objects_(static_cast<int>(capacity)) { }
+  ObjectGroup(size_t capacity, v8::RetainedObjectInfo* info)
+      : objects_(static_cast<int>(capacity)),
+        info_(info) { }
+  ~ObjectGroup() { if (info_ != NULL) info_->Dispose(); }
 
   List<Object**> objects_;
+  v8::RetainedObjectInfo* info_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ObjectGroup);
 };
 
 
@@ -75,6 +81,8 @@ class GlobalHandles : public AllStatic {
                        void* parameter,
                        WeakReferenceCallback callback);
 
+  static void SetWrapperClassId(Object** location, uint16_t class_id);
+
   // Returns the current number of weak handles.
   static int NumberOfWeakHandles() { return number_of_weak_handles_; }
 
@@ -105,6 +113,9 @@ class GlobalHandles : public AllStatic {
   // Iterates over all handles.
   static void IterateAllRoots(ObjectVisitor* v);
 
+  // Iterates over all handles that have embedder-assigned class ID.
+  static void IterateAllRootsWithClassIds(ObjectVisitor* v);
+
   // Iterates over all weak roots in heap.
   static void IterateWeakRoots(ObjectVisitor* v);
 
@@ -119,7 +130,9 @@ class GlobalHandles : public AllStatic {
   // Add an object group.
   // Should only used in GC callback function before a collection.
   // All groups are destroyed after a mark-compact collection.
-  static void AddGroup(Object*** handles, size_t length);
+  static void AddGroup(Object*** handles,
+                       size_t length,
+                       v8::RetainedObjectInfo* info);
 
   // Returns the object groups.
   static List<ObjectGroup*>* ObjectGroups();