[WIP] New GC related APIs.

src/heap-snapshot-generator.cc

Index: src/heap-snapshot-generator.cc
diff --git a/src/heap-snapshot-generator.cc b/src/heap-snapshot-generator.cc
index fb239aa3cf6dd82cc04af83c7be2afdcac8ac470..d073a8d1c2212e7ac2303dd6bcafa706b52da12a 100644
--- a/src/heap-snapshot-generator.cc
+++ b/src/heap-snapshot-generator.cc
@@ -1943,15 +1943,19 @@ void NativeObjectsExplorer::FillRetainedObjects() {
   List<ObjectGroup*>* groups = isolate->global_handles()->object_groups();
   for (int i = 0; i < groups->length(); ++i) {
     ObjectGroup* group = groups->at(i);
-    if (group->info_ == NULL) continue;
-    List<HeapObject*>* list = GetListMaybeDisposeInfo(group->info_);
-    for (size_t j = 0; j < group->length_; ++j) {
-      HeapObject* obj = HeapObject::cast(*group->objects_[j]);
+    if (group->info == NULL) {
+      delete group;
+      continue;
+    }
+    List<HeapObject*>* list = GetListMaybeDisposeInfo(group->info);
+    for (int j = 0; j < group->objects.length(); ++j) {
+      HeapObject* obj = HeapObject::cast(*group->objects[j]);
       list->Add(obj);
       in_groups_.Insert(obj);
     }
-    group->info_ = NULL;  // Acquire info object ownership.
+    delete group;
   }
+  delete groups;
   isolate->global_handles()->RemoveObjectGroups();
   isolate->heap()->CallGCEpilogueCallbacks(major_gc_type);
   // Record objects that are not in ObjectGroups, but have class ID.