Promise init callback takes resolve and reject functions

LayoutTests/fast/js/resources/Promise-fulfill-in-workers.js

-importScripts('./js-test-pre.js');
-
-description('Test Promise.');
-
-jsTestIsAsync = true;
-
-var resolver;
-var promise = new Promise(function(r) { resolver = r; });
-var promiseState = 'pending';
-var promiseResult = undefined;
-promise.then(function(result) {
-  promiseState = 'fulfilled';
-  promiseResult = result;
-}, function(result) {
-  promiseState = 'rejected';
-  promiseResult = result;
-});
-
-shouldBeEqualToString('promiseState', 'pending');
-
-resolver.fulfill('hello');
-
-shouldBeEqualToString('promiseState', 'pending');
-
-promise.then(function() {
-  shouldBeEqualToString('promiseState', 'fulfilled');
-  shouldBeEqualToString('promiseResult', 'hello');
-  finishJSTest();
-}, function() {
-  testFailed('promise is rejected.');
-  finishJSTest();
-});