Introduce one way dependencies into object grouping.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index ddbd6af5475139285f3994baed14e5a09d04cefc..8c195ebd92b7b60b737e8c00a351eb4e23df8e8f 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2718,6 +2718,17 @@ class V8EXPORT V8 {
                              RetainedObjectInfo* info = NULL);
 
   /**
+   * Allows the host application to declare implicit references between
+   * the objects: if |parent| is alive, all |children| are alive too.
+   * After each garbage collection, all implicit references
+   * are removed.  It is intended to be used in the before-garbage-collection
+   * callback function.
+   */
+  static void AddImplicitRefGroup(Persistent<Object> parent,

[Vitaly Repeshko, 2011/03/15 18:45:35]

I don't like the name for two reasons: "Ref" is an abbreviation and there's no
group here. As we discussed we should avoid any implications on the relations
between children. "AddImplicitReferences", "AddImplicitChildren"?

+                                  Persistent<Value>* children,
+                                  size_t length);
+
+  /**
    * Initializes from snapshot if possible. Otherwise, attempts to
    * initialize from scratch.  This function is called implicitly if
    * you use the API without calling it first.