Eliminate internal and hidden links to oddballs and other non-essential objects in heap snapshot.

src/profile-generator.h

 // Copyright 2011 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 962 matching lines @@
                       HeapEntry::Type type,
                       const char* name,
                       int children_count,
                       int retainers_count);
   const char* GetSystemEntryName(HeapObject* object);
   void ExtractReferences(HeapObject* obj);
   void ExtractClosureReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractPropertyReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractElementReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractInternalReferences(JSObject* js_obj, HeapEntry* entry);
+  bool IsEssentialObject(Object* object);
   void SetClosureReference(HeapObject* parent_obj,
                            HeapEntry* parent,
                            String* reference_name,
                            Object* child);
   void SetNativeBindReference(HeapObject* parent_obj,
                               HeapEntry* parent,
                               const char* reference_name,
                               Object* child);
   void SetElementReference(HeapObject* parent_obj,
                            HeapEntry* parent,
@@ skipping 202 matching lines @@
 
   friend class HeapSnapshotJSONSerializerEnumerator;
   friend class HeapSnapshotJSONSerializerIterator;
 
   DISALLOW_COPY_AND_ASSIGN(HeapSnapshotJSONSerializer);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROFILE_GENERATOR_H_