Add a new weak handle callback that passes an Isolate to an embedder

src/global-handles.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 111 matching lines @@
 
   // Make the global handle weak and set the callback parameter for the
   // handle.  When the garbage collector recognizes that only weak global
   // handles point to an object the handles are cleared and the callback
   // function is invoked (for each handle) with the handle and corresponding
   // parameter as arguments.  Note: cleared means set to Smi::FromInt(0). The
   // reason is that Smi::FromInt(0) does not change during garage collection.
   void MakeWeak(Object** location,
                 void* parameter,
                 WeakReferenceCallback callback);
+  void MakeWeak(Object** location,
+                void* parameter,
+                WeakenedReferenceCallback callback);
 
   static void SetWrapperClassId(Object** location, uint16_t class_id);
   static uint16_t GetWrapperClassId(Object** location);
 
   // Returns the current number of weak handles.
   int NumberOfWeakHandles() { return number_of_weak_handles_; }
 
   void RecordStats(HeapStats* stats);
 
   // Returns the current number of weak handles to global objects.
@@ skipping 34 matching lines @@
 
   // Iterates over all handles.
   void IterateAllRoots(ObjectVisitor* v);
 
   // Iterates over all handles that have embedder-assigned class ID.
   void IterateAllRootsWithClassIds(ObjectVisitor* v);
 
   // Iterates over all weak roots in heap.
   void IterateWeakRoots(ObjectVisitor* v);
 
-  // Iterates over weak roots that are bound to a given callback.
-  void IterateWeakRoots(WeakReferenceGuest f,
-                        WeakReferenceCallback callback);
-
   // Find all weak handles satisfying the callback predicate, mark
   // them as pending.
   void IdentifyWeakHandles(WeakSlotCallback f);
 
   // NOTE: Three ...NewSpace... functions below are used during
   // scavenge collections and iterate over sets of handles that are
   // guaranteed to contain all handles holding new space objects (but
   // may also include old space objects).
 
   // Iterates over strong and dependent handles. See the node above.
@@ skipping 89 matching lines @@
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(GlobalHandles);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBAL_HANDLES_H_