Introduce kGCCallbackForced flag.

src/heap-snapshot-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2110 matching lines @@
     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]);
       list->Add(obj);
       in_groups_.Insert(obj);
     }
     group->info = NULL;  // Acquire info object ownership.
   }
   isolate->global_handles()->RemoveObjectGroups();
-  isolate->heap()->CallGCEpilogueCallbacks(major_gc_type);
+  isolate->heap()->CallGCEpilogueCallbacks(major_gc_type, kNoGCCallbackFlags);
   // Record objects that are not in ObjectGroups, but have class ID.
   GlobalHandlesExtractor extractor(this);
   isolate->global_handles()->IterateAllRootsWithClassIds(&extractor);
   embedder_queried_ = true;
 }
 
 
 void NativeObjectsExplorer::FillImplicitReferences() {
   Isolate* isolate = isolate_;
   List<ImplicitRefGroup*>* groups =
@@ skipping 812 matching lines @@
   writer_->AddString("\"<dummy>\"");
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 } }  // namespace v8::internal