New GC APIs, try 2.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index dddcd7dcf502bb3f3216763b9477dcf724a0299f..7286eca8dccbd6cc3b9f4094c932db537323b3c8 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5978,6 +5978,22 @@ v8::Local<v8::Context> Isolate::GetCurrentContext() {
 }
 
 
+void Isolate::SetObjectGroupId(const Persistent<Value>& object,
+                                   UniqueId id) {
+  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
+  internal_isolate->global_handles()->SetObjectGroupId(
+      reinterpret_cast<i::Object**>(*object), id);
+}
+
+
+void Isolate::SetReferenceFromGroup(UniqueId id,
+                                    const Persistent<Value>& object) {
+  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
+  internal_isolate->global_handles()
+      ->SetReferenceFromGroup(id, reinterpret_cast<i::Object**>(*object));
+}
+
+
 void V8::SetGlobalGCPrologueCallback(GCCallback callback) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::V8::SetGlobalGCPrologueCallback()")) return;
@@ -7171,6 +7187,12 @@ size_t HeapProfiler::GetProfilerMemorySize() {
 }
 
 
+void HeapProfiler::SetRetainedObjectInfo(UniqueId id,
+                                         RetainedObjectInfo* info) {
+  reinterpret_cast<i::HeapProfiler*>(this)->SetRetainedObjectInfo(id, info);
+}
+
+
 v8::Testing::StressType internal::Testing::stress_type_ =
     v8::Testing::kStressTypeOpt;