Added Object.defineProperty + needed internal functionality:...

src/messages.js

 // 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 144 matching lines @@
       invalid_in_operator_use:      "Cannot use 'in' operator to search for '%0' in %1",
       instanceof_function_expected: "Expecting a function in instanceof check, but got %0",
       instanceof_nonobject_proto:   "Function has non-object prototype '%0' in instanceof check",
       null_to_object:               "Cannot convert null to object",
       reduce_no_initial:            "Reduce of empty array with no initial value",
       getter_must_be_callable:      "Getter must be a function: %0",
       setter_must_be_callable:      "Setter must be a function: %0",
       value_and_accessor:           "Invalid property.  A property cannot both have accessors and be writable or have a value: %0",
       proto_object_or_null:         "Object prototype may only be an Object or null",
       property_desc_object:         "Property description must be an object: %0",
+      redefine_disallowed:          "Cannot redefine property: %0",
+      define_disallowed:            "Cannot define property, object is not extensible: %0",
       // RangeError
       invalid_array_length:         "Invalid array length",
       stack_overflow:               "Maximum call stack size exceeded",
       apply_overflow:               "Function.prototype.apply cannot support %0 arguments",
       // SyntaxError
       unable_to_parse:              "Parse error",
       duplicate_regexp_flag:        "Duplicate RegExp flag %0",
       invalid_regexp:               "Invalid RegExp pattern /%0/",
       illegal_break:                "Illegal break statement",
       illegal_continue:             "Illegal continue statement",
@@ skipping 752 matching lines @@
     return this.name + ": " + FormatMessage({ type: type, args: this.arguments });
   }
   var message = this.message;
   return this.name + (message ? (": " + message) : "");
 }, DONT_ENUM);
 
 
 // Boilerplate for exceptions for stack overflows. Used from
 // Top::StackOverflow().
 const kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);