Implement V8 extras utils object

src/promise.js

Index: src/promise.js
diff --git a/src/promise.js b/src/promise.js
index 97fc69cd266573b956399c129ad5c25dc95ed462..b509e76e4a9d16c9a7ba1db080b1708236d38777 100644
--- a/src/promise.js
+++ b/src/promise.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-(function(global, utils) {
+(function(global, utils, extrasUtils) {
 
 "use strict";
 
@@ -388,4 +388,13 @@ utils.InstallFunctions(GlobalPromise.prototype, DONT_ENUM, [
   "promise_then", PromiseThen,
 ]);
 
+// This allows extras to create promises quickly without building extra
+// resolve/reject closures, and allows them to later resolve and reject any
+// promise without having to hold on to those closures forever.
+utils.InstallFunctions(extrasUtils, 0, [
+  "createPromise", PromiseCreate,
+  "resolvePromise", PromiseResolve,
+  "rejectPromise", PromiseReject
+]);
+
 })