Let the callers of V8::ContextDisposedNoticication() know...

src/heap.h

 // Copyright 2006-2008 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 625 matching lines @@
 
   // Performs garbage collection operation.
   // Returns whether required_space bytes are available after the collection.
   static bool CollectGarbage(int required_space, AllocationSpace space);
 
   // Performs a full garbage collection. Force compaction if the
   // parameter is true.
   static void CollectAllGarbage(bool force_compaction);
 
   // Notify the heap that a context has been disposed.
-  static void NotifyContextDisposed();
+  static int NotifyContextDisposed() { return ++contexts_disposed_; }
 
   // Utility to invoke the scavenger. This is needed in test code to
   // ensure correct callback for weak global handles.
   static void PerformScavenge();
 
 #ifdef DEBUG
   // Utility used with flag gc-greedy.
   static bool GarbageCollectionGreedyCheck();
 #endif
 
@@ skipping 1079 matching lines @@
 
   // To speed up scavenge collections new space string are kept
   // separate from old space strings.
   static List<Object*> new_space_strings_;
   static List<Object*> old_space_strings_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_