WebUI: Allow rejecting a promise that is returned from cr.sendWithPromise().

ui/webui/resources/js/cr/promise_resolver.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview PromiseResolver is a helper class that allows creating a
  * Promise that will be fulfilled (resolved or rejected) some time later.
  *
  * Example:
  *  var resolver = new PromiseResolver();
  *  resolver.promise.then(function(result) {
  *    console.log('resolved with', result);
  *  });
  *  ...
  *  ...
  *  resolver.resolve({hello: 'world'});
  */
 
-/**
- * @constructor
- */
-function PromiseResolver() {
-  /** @type {!Function} */
-  this.resolve;
+cr.define('cr', function() {

[Dan Beam, 2016/03/02 19:17:40]

why does this need to be namespaced to cr.*?

[dpapad, 2016/03/02 20:02:09]

Moved one level up.

+  console.log('promise_resolver.js running');
+  /** @constructor */
+  function PromiseResolver() {
+    /** @type {!Function} */
+    this.resolve;
 
-  /** @type {!Function} */
-  this.reject;
+    /** @type {!Function} */
+    this.reject;
 
-  /** @type {!Promise} */
-  this.promise = new Promise(function(resolve, reject) {
-    this.resolve = resolve;
-    this.reject = reject;
-  }.bind(this));
-}
+    /** @type {!Promise} */
+    this.promise = new Promise(function(resolve, reject) {
+      this.resolve = resolve;
+      this.reject = reject;
+    }.bind(this));
+  }
+
+  return {
+    PromiseResolver: PromiseResolver
+  };
+});