[api] add API for Promise status and result.

src/js/macros.py

 # Copyright 2006-2009 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
@@ skipping 181 matching lines @@
 define kArrayProtectorDirtied = 24;
 define kArraySpeciesModified = 25;
 define kArrayPrototypeConstructorModified = 26;
 define kArrayInstanceProtoModified = 27;
 define kArrayInstanceConstructorModified = 28;
 define kLegacyFunctionDeclaration = 29;
 define kRegExpPrototypeSourceGetter = 30;
 define kRegExpPrototypeOldFlagGetter = 31;
 
 # [[PromiseState]] values:
-# These values should be kept in sync with PromiseStatus in globals.h
+# These values must be kept in sync with v8::Promise::PromiseState in
+# include/v8.h
 define kPending = 0;
 define kFulfilled = 1;
 define kRejected = 2;
 
 define kResolveCallback = 0;
 define kRejectCallback = 1;