Better align heap snapshots contents with debugger info.

src/objects.cc

 // Copyright 2010 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 1162 matching lines @@
 }
 
 
 String* JSObject::constructor_name() {
   if (IsJSFunction()) {
     return Heap::closure_symbol();
   }
   if (map()->constructor()->IsJSFunction()) {
     JSFunction* constructor = JSFunction::cast(map()->constructor());
     String* name = String::cast(constructor->shared()->name());
-    return name->length() > 0 ? name : constructor->shared()->inferred_name();
+    if (name->length() > 0) return name;
+    String* inferred_name = constructor->shared()->inferred_name();
+    if (inferred_name->length() > 0) return inferred_name;
+    Object* proto = GetPrototype();
+    if (proto->IsJSObject()) return JSObject::cast(proto)->constructor_name();
   }
   // If the constructor is not present, return "Object".
   return Heap::Object_symbol();
 }
 
 
 Object* JSObject::AddFastPropertyUsingMap(Map* new_map,
                                           String* name,
                                           Object* value) {
   int index = new_map->PropertyIndexFor(name);
@@ skipping 7862 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal