Add infrastructure to keep track of references to prototypes.

src/factory.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 
 namespace v8 {
@@ skipping 27 matching lines @@
   // so the return type must be the general fixed array class.
   Handle<FixedArrayBase> NewFixedDoubleArray(
       int size,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a new fixed double array with hole values.
   Handle<FixedArrayBase> NewFixedDoubleArrayWithHoles(
       int size,
       PretenureFlag pretenure = NOT_TENURED);
 
+  Handle<WeakFixedArray> NewWeakFixedArray(int size);
+
   Handle<ConstantPoolArray> NewConstantPoolArray(
       const ConstantPoolArray::NumberOfEntries& small);
 
   Handle<ConstantPoolArray> NewExtendedConstantPoolArray(
       const ConstantPoolArray::NumberOfEntries& small,
       const ConstantPoolArray::NumberOfEntries& extended);
 
   Handle<OrderedHashSet> NewOrderedHashSet();
   Handle<OrderedHashMap> NewOrderedHashMap();
 
@@ skipping 668 matching lines @@
   // Reinitialize a JSProxy into an (empty) JS object of respective type and
   // size, but keeping the original prototype.  The receiver must have at least
   // the size of the new object.  The object is reinitialized and behaves as an
   // object that has been freshly allocated.
   void ReinitializeJSProxy(Handle<JSProxy> proxy, InstanceType type, int size);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_