feat(elements): implement NgElementApplicationContext

packages/elements/src/ng-element-application-context.ts

@@ -0,0 +1,18 @@
+/**
+ * @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 {ApplicationRef, Injector, NgZone} from '@angular/core';
+
+export class NgElementApplicationContext {
+  applicationRef = this.injector.get<ApplicationRef>(ApplicationRef);
+  ngZone = this.injector.get<NgZone>(NgZone);
+
+  constructor(public injector: Injector) {}
+
+  runInNgZone<R>(cb: () => R): R { return this.ngZone.run(cb); }
+}