Implement API functions for handling the AccessorDescriptor

src/handles.h

Index: src/handles.h
diff --git a/src/handles.h b/src/handles.h
index 13c6dd67f71e4aca1c7b59e6057f143a29347fd3..a023dc673fc145be655a1d2befa52e1117643284 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -277,6 +277,16 @@ Handle<JSObject> Copy(Handle<JSObject> obj);
 
 Handle<Object> SetAccessor(Handle<JSObject> obj, Handle<AccessorInfo> info);
 
+Handle<Object> SetAccessor(Handle<JSObject> obj,
+                           Handle<String> key,
+                           bool is_getter,
+                           Handle<Object> fun,
+                           PropertyAttributes attributes);
+
+Handle<Object> GetAccessor(Handle<JSObject> obj,
+                           Handle<String> key,
+                           bool is_getter);
+
 Handle<FixedArray> AddKeysFromJSArray(Handle<FixedArray>,
                                       Handle<JSArray> array);