feat(AsyncScheduler): add AsyncScheduler implementation

src/Rx.DOM.ts

@@ -124,9 +124,11 @@ import {EmptyError} from './util/EmptyError';
 import {ArgumentOutOfRangeError} from './util/ArgumentOutOfRangeError';
 import {ObjectUnsubscribedError} from './util/ObjectUnsubscribedError';
 import {asap} from './scheduler/asap';
+import {async} from './scheduler/async';
 import {queue} from './scheduler/queue';
 import {animationFrame} from './scheduler/animationFrame';
 import {AsapScheduler} from './scheduler/AsapScheduler';
+import {AsyncScheduler} from './scheduler/AsyncScheduler';
 import {QueueScheduler} from './scheduler/QueueScheduler';
 import {AnimationFrameScheduler} from './scheduler/AnimationFrameScheduler';
 import {rxSubscriber} from './symbol/rxSubscriber';
@@ -136,6 +138,7 @@ import {AjaxRequest, AjaxResponse, AjaxError, AjaxTimeoutError} from './observab
 /* tslint:disable:no-var-keyword */
 var Scheduler = {
   asap,
+  async,
   queue,
   animationFrame
 };

src/Rx.KitchenSink.ts

@@ -172,8 +172,10 @@ import {EmptyError} from './util/EmptyError';
 import {ObjectUnsubscribedError} from './util/ObjectUnsubscribedError';
 import {ArgumentOutOfRangeError} from './util/ArgumentOutOfRangeError';
 import {asap} from './scheduler/asap';
+import {async} from './scheduler/async';
 import {queue} from './scheduler/queue';
 import {AsapScheduler} from './scheduler/AsapScheduler';
+import {AsyncScheduler} from './scheduler/AsyncScheduler';
 import {QueueScheduler} from './scheduler/QueueScheduler';
 import {TimeInterval} from './operator/timeInterval';
 import {TestScheduler} from './testing/TestScheduler';
@@ -184,6 +186,7 @@ import {rxSubscriber} from './symbol/rxSubscriber';
 /* tslint:disable:no-var-keyword */
 var Scheduler = {
   asap,
+  async,
   queue
 };
 

src/Rx.ts

@@ -129,15 +129,18 @@ import {EmptyError} from './util/EmptyError';
 import {ArgumentOutOfRangeError} from './util/ArgumentOutOfRangeError';
 import {ObjectUnsubscribedError} from './util/ObjectUnsubscribedError';
 import {asap} from './scheduler/asap';
+import {async} from './scheduler/async';
 import {queue} from './scheduler/queue';
 import {AsapScheduler} from './scheduler/AsapScheduler';
+import {AsyncScheduler} from './scheduler/AsyncScheduler';
 import {QueueScheduler} from './scheduler/QueueScheduler';
 import {rxSubscriber} from './symbol/rxSubscriber';
 /* tslint:enable:no-unused-variable */
 
 /* tslint:disable:no-var-keyword */
 var Scheduler = {
   asap,
+  async,
   queue
 };
 

src/scheduler/AsyncScheduler.ts

@@ -0,0 +1,10 @@
+import {Action} from './Action';
+import {FutureAction} from './FutureAction';
+import {Subscription} from '../Subscription';
+import {QueueScheduler} from './QueueScheduler';
+
+export class AsyncScheduler extends QueueScheduler {
+  scheduleNow<T>(work: (x?: any) => Subscription, state?: any): Action {
+    return new FutureAction(this, work).schedule(state, 0);
+  }
+}

src/scheduler/async.ts

@@ -0,0 +1,3 @@
+import {AsyncScheduler} from './AsyncScheduler';
+
+export const async = new AsyncScheduler();