Added first shot at a development shell

src/natives.h

Index: src/natives.h
diff --git a/src/natives.h b/src/natives.h
index 0bb879f27c30859a558ae691a3e124f9e9a85f11..3eb80909a171a3a8fc19d02c6632659443474975 100644
--- a/src/natives.h
+++ b/src/natives.h
@@ -34,7 +34,12 @@ typedef bool (*NativeSourceCallback)(Vector<const char> name,
                                      Vector<const char> source,
                                      int index);
 
-class Natives {
+enum NativeType {
+  CORE, D8
+};
+
+template <NativeType type>
+class NativesCollection {
  public:
   // Number of built-in scripts.
   static int GetBuiltinsCount();
@@ -50,6 +55,8 @@ class Natives {
   static Vector<const char> GetScriptName(int index);
 };
 
+typedef NativesCollection<CORE> Natives;
+
 } }  // namespace v8::internal
 
 #endif  // V8_NATIVES_H_