Introduce one way dependencies into object grouping.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 26d2246aaea0c01ae2733b160961174834cb0058..9ba10c051ce1cc7da49b0cb87f194a10bb6ff35e 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -4126,11 +4126,22 @@ void V8::AddObjectGroup(Persistent<Value>* objects,
                         RetainedObjectInfo* info) {
   if (IsDeadCheck("v8::V8::AddObjectGroup()")) return;
   STATIC_ASSERT(sizeof(Persistent<Value>) == sizeof(i::Object**));
-  i::GlobalHandles::AddGroup(
+  i::GlobalHandles::AddObjectGroup(
       reinterpret_cast<i::Object***>(objects), length, info);
 }
 
 
+void V8::AddImplicitRefGroup(Persistent<Object> parent,
+                             Persistent<Value>* children,
+                             size_t length) {
+  if (IsDeadCheck("v8::V8::AddImplicitRefGroup()")) return;
+  STATIC_ASSERT(sizeof(Persistent<Value>) == sizeof(i::Object**));
+  i::GlobalHandles::AddImplicitRefGroup(
+      *Utils::OpenHandle(*parent),
+      reinterpret_cast<i::Object***>(children), length);
+}
+
+
 int V8::AdjustAmountOfExternalAllocatedMemory(int change_in_bytes) {
   if (IsDeadCheck("v8::V8::AdjustAmountOfExternalAllocatedMemory()")) return 0;
   return i::Heap::AdjustAmountOfExternalAllocatedMemory(change_in_bytes);