Introduce experimental natives that are enabled by a runtime flag.

src/natives.h

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 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
 //       with the distribution.
@@ skipping 17 matching lines @@
 #define V8_NATIVES_H_
 
 namespace v8 {
 namespace internal {
 
 typedef bool (*NativeSourceCallback)(Vector<const char> name,
                                      Vector<const char> source,
                                      int index);
 
 enum NativeType {
-  CORE, D8, I18N
+  CORE, EXPERIMENTAL, D8, I18N
 };
 
 template <NativeType type>
 class NativesCollection {
  public:
   // Number of built-in scripts.
   static int GetBuiltinsCount();
   // Number of debugger implementation scripts.
   static int GetDebuggerCount();
 
   // These are used to access built-in scripts.  The debugger implementation
   // scripts have an index in the interval [0, GetDebuggerCount()).  The
   // non-debugger scripts have an index in the interval [GetDebuggerCount(),
   // GetNativesCount()).
   static int GetIndex(const char* name);
   static Vector<const char> GetScriptSource(int index);
   static Vector<const char> GetScriptName(int index);
 };
 
 typedef NativesCollection<CORE> Natives;
+typedef NativesCollection<EXPERIMENTAL> ExperimentalNatives;
 
 } }  // namespace v8::internal
 
 #endif  // V8_NATIVES_H_