Implement ES6 symbol registry and predefined symbols

test/mjsunit/harmony/private.js

 // Copyright 2013 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 310 matching lines @@
   // but not between scavenges.  This must also apply for symbol keys.
   var key = Symbol("key");
   var a = {};
   a[key] = "abc";
 
   for (var i = 0; i < 100000; i++) {
     a[key] += "a";  // Allocations cause a scavenge.
   }
 }
 TestCachedKeyAfterScavenge();
+
+
+function TestGetOwnPropertySymbols() {
+  var privateSymbol = %CreatePrivateSymbol("private")
+  var publicSymbol = Symbol()
+  var publicSymbol2 = Symbol()
+  var obj = {}
+  obj[publicSymbol] = 1
+  obj[privateSymbol] = 2
+  obj[publicSymbol2] = 3
+  var syms = Object.getOwnPropertySymbols(obj)
+  assertEquals(syms, [publicSymbol, publicSymbol2])
+}
+TestGetOwnPropertySymbols()