Add size_t length argument to v8::ArrayBuffer::Allocator::Free.

include/v8.h

 // Copyright 2012 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 2407 matching lines @@
      * Allocate |length| bytes. Return NULL if allocation is not successful.
      * Memory does not have to be initialized.
      */
     virtual void* AllocateUninitialized(size_t length) {
       // Override with call to |Allocate| for compatibility
       // with legacy version.
       return Allocate(length);
     }
 
     /**
-     * Free the memory pointed to |data|. That memory is guaranteed to be
-     * previously allocated by |Allocate|.
+     * Free the memory block of size |length|, pointed to by |data|.
+     * That memory is guaranteed to be previously allocated by |Allocate|.
      */
-    virtual void Free(void* data) = 0;
+    virtual void Free(void* data, size_t length) {
+      // Override with call to |Free(void*)| for compatibility
+      // with legacy version.
+      Free(data);
+    }
+
+    /**
+     * Deprecated. Never called directly by V8.
+     * For compatibility with legacy version of this interface.
+     */
+    virtual void Free(void* data);
   };
 
   /**
    * The contents of an |ArrayBuffer|. Externalization of |ArrayBuffer|
    * returns an instance of this class, populated, with a pointer to data
    * and byte length.
    *
    * The Data pointer of ArrayBuffer::Contents is always allocated with
    * Allocator::Allocate that is set with V8::SetArrayBufferAllocator.
    *
@@ skipping 4085 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_