Add object hidden properties to heap snapshot

src/heap-snapshot-generator.h

Index: src/heap-snapshot-generator.h
diff --git a/src/heap-snapshot-generator.h b/src/heap-snapshot-generator.h
index 8717f8f25edccfefe9878b05959897a83578a87e..491790dee0fa5e474fbb4c443bbe86139ef99cb9 100644
--- a/src/heap-snapshot-generator.h
+++ b/src/heap-snapshot-generator.h
@@ -422,6 +422,7 @@ class V8HeapExplorer : public HeapEntriesAllocator {
   void ExtractJSArrayBufferReferences(int entry, JSArrayBuffer* buffer);
   void ExtractClosureReferences(JSObject* js_obj, int entry);
   void ExtractPropertyReferences(JSObject* js_obj, int entry);
+  void ExtractHiddenPropertyReferences(JSObject* obj, int entry);
   bool ExtractAccessorPairProperty(JSObject* js_obj, int entry,
                                    Object* key, Object* callback_obj);
   void ExtractElementReferences(JSObject* js_obj, int entry);