Add support for per-isolate private symbols

src/promise.js

 // Copyright 2012 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 24 matching lines @@
 
 
 var $Promise = Promise;
 
 
 //-------------------------------------------------------------------
 
 // Core functionality.
 
 // Status values: 0 = pending, +1 = resolved, -1 = rejected
-var promiseStatus = NEW_PRIVATE("Promise#status");
-var promiseValue = NEW_PRIVATE("Promise#value");
-var promiseOnResolve = NEW_PRIVATE("Promise#onResolve");
-var promiseOnReject = NEW_PRIVATE("Promise#onReject");
-var promiseRaw = NEW_PRIVATE("Promise#raw");
+var promiseStatus = GLOBAL_PRIVATE("Promise#status");
+var promiseValue = GLOBAL_PRIVATE("Promise#value");
+var promiseOnResolve = GLOBAL_PRIVATE("Promise#onResolve");
+var promiseOnReject = GLOBAL_PRIVATE("Promise#onReject");
+var promiseRaw = GLOBAL_PRIVATE("Promise#raw");
 
 function IsPromise(x) {
   return IS_SPEC_OBJECT(x) && %HasLocalProperty(x, promiseStatus);
 }
 
 function Promise(resolver) {
   if (resolver === promiseRaw) return;
   if (!%_IsConstructCall()) throw MakeTypeError('not_a_promise', [this]);
   if (typeof resolver !== 'function')
     throw MakeTypeError('resolver_not_a_function', [resolver]);
@@ skipping 258 matching lines @@
     "resolve", PromiseCast
   ]);
   InstallFunctions($Promise.prototype, DONT_ENUM, [
     "chain", PromiseChain,
     "then", PromiseThen,
     "catch", PromiseCatch
   ]);
 }
 
 SetUpPromise();