[WIP] New GC related APIs.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index a7b45c4307e7a51b2642d94e6c77a56c18cac0a8..9ade71393e288dd52ccd845a5330a71a71a7e075 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5797,6 +5797,23 @@ void V8::AddObjectGroup(Isolate* exported_isolate,
 }
 
 
+void V8::SetObjectGroupId(Isolate* exported_isolate,
+                          const Persistent<Value>& object,
+                          UniqueId id) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(exported_isolate);
+  isolate->global_handles()->SetObjectGroupId(
+      reinterpret_cast<i::Object**>(*object), id);
+}
+
+
+void V8::SetRetainedObjectInfo(Isolate* exported_isolate,
+                               UniqueId id,
+                               RetainedObjectInfo* info) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(exported_isolate);
+  isolate->global_handles()->SetRetainedObjectInfo(id, info);
+}
+
+
 void V8::AddImplicitReferences(Persistent<Object> parent,
                                Persistent<Value>* children,
                                size_t length) {