cleanup api-natives a bit

src/api-natives.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_API_NATIVES_H_
 #define V8_API_NATIVES_H_
 
 #include "src/handles.h"
 
 namespace v8 {
 namespace internal {
 
 class ApiNatives {
  public:
   MUST_USE_RESULT static MaybeHandle<JSFunction> InstantiateFunction(
       Handle<FunctionTemplateInfo> data);
+
   MUST_USE_RESULT static MaybeHandle<JSObject> InstantiateObject(
       Handle<ObjectTemplateInfo> data);
+
   MUST_USE_RESULT static MaybeHandle<FunctionTemplateInfo> ConfigureInstance(
       Isolate* isolate, Handle<FunctionTemplateInfo> instance,
       Handle<JSObject> data);
 
   enum ApiInstanceType {
     JavaScriptObjectType,
     GlobalObjectType,
     GlobalProxyType
   };
 
   static Handle<JSFunction> CreateApiFunction(Isolate* isolate,
                                               Handle<FunctionTemplateInfo> obj,
                                               Handle<Object> prototype,
                                               ApiInstanceType instance_type);
+
+  static void AddDataProperty(Isolate* isolate, Handle<TemplateInfo> info,
+                              Handle<Name> name, Handle<Object> value,
+                              PropertyAttributes attributes);
+
+  static void AddAccessorProperty(Isolate* isolate, Handle<TemplateInfo> info,
+                                  Handle<Name> name,
+                                  Handle<FunctionTemplateInfo> getter,
+                                  Handle<FunctionTemplateInfo> setter,
+                                  PropertyAttributes attributes);
+
+  static void AddNativeDataProperty(Isolate* isolate, Handle<TemplateInfo> info,
+                                    Handle<AccessorInfo> property);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif