Expose v8::Function::IsBuiltin to public API.

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 2472 matching lines @@
    * kLineOffsetNotFound if no information available.
    */
   int GetScriptLineNumber() const;
   /**
    * Returns zero based column number of function body and
    * kLineOffsetNotFound if no information available.
    */
   int GetScriptColumnNumber() const;
 
   /**
+   * Tells whether this function is builtin.
+   */
+  bool IsBuiltin() const;
+
+  /**
    * Returns scriptId object.
    */
   V8_DEPRECATED("Use ScriptId instead", Handle<Value> GetScriptId()) const;
 
   /**
    * Returns scriptId.
    */
   int ScriptId() const;
 
   ScriptOrigin GetScriptOrigin() const;
@@ skipping 3985 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_