feat(router): add support for lazily loaded modules

modules/@angular/router/src/router_config_loader.ts

@@ -0,0 +1,29 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {AppModuleFactoryLoader, AppModuleRef, ComponentFactoryResolver} from '@angular/core';
+import {Observable} from 'rxjs/Observable';
+import {fromPromise} from 'rxjs/observable/fromPromise';
+
+import {ROUTER_CONFIG} from './common_router_providers';
+import {Route} from './config';
+
+export class LoadedRouterConfig {
+  constructor(public routes: Route[], public factoryResolver: ComponentFactoryResolver) {}
+}
+
+export class RouterConfigLoader {
+  constructor(private loader: AppModuleFactoryLoader) {}
+
+  load(path: string): Observable<LoadedRouterConfig> {
+    return fromPromise(this.loader.load(path).then(r => {
+      const ref = r.create();
+      return new LoadedRouterConfig(ref.injector.get(ROUTER_CONFIG), ref.componentFactoryResolver);
+    }));
+  }
+}