WIP: Create a public v8::DictionarySchema API for bulk reads from dict objects.

src/api.h

Index: src/api.h
diff --git a/src/api.h b/src/api.h
index 8deb117bccd2154f6a9b63fa011b4110b12ab169..7761cefcc67df31879950776da0b2d22407d33ba 100644
--- a/src/api.h
+++ b/src/api.h
@@ -111,7 +111,8 @@ class RegisteredExtension {
   V(NativeWeakMap, JSWeakMap)                  \
   V(debug::GeneratorObject, JSGeneratorObject) \
   V(debug::Script, Script)                     \
-  V(Promise, JSPromise)
+  V(Promise, JSPromise)                        \
+  V(DictionarySchema, DictionarySchema)
 
 class Utils {
  public:
@@ -209,6 +210,8 @@ class Utils {
       v8::internal::Handle<v8::internal::JSWeakMap> obj);
   static inline Local<Function> CallableToLocal(
       v8::internal::Handle<v8::internal::JSReceiver> obj);
+  static inline Local<DictionarySchema> ToLocal(
+      v8::internal::Handle<v8::internal::DictionarySchema> obj);
 
 #define DECLARE_OPEN_HANDLE(From, To) \
   static inline v8::internal::Handle<v8::internal::To> \
@@ -325,6 +328,7 @@ MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)
 MAKE_TO_LOCAL(ExternalToLocal, JSObject, External)
 MAKE_TO_LOCAL(NativeWeakMapToLocal, JSWeakMap, NativeWeakMap)
 MAKE_TO_LOCAL(CallableToLocal, JSReceiver, Function)
+MAKE_TO_LOCAL(ToLocal, DictionarySchema, DictionarySchema)
 
 #undef MAKE_TO_LOCAL_TYPED_ARRAY
 #undef MAKE_TO_LOCAL