fix(focus-monitor): set up global listeners in root zone

Author: josephperrott

src/cdk/a11y/focus-monitor.ts

@@ -5,7 +5,6 @@
  * 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 {Platform, supportsPassiveEventListeners} from '@angular/cdk/platform';
 import {
   Directive,
@@ -202,7 +201,7 @@ export class FocusMonitor implements OnDestroy {
 
     // Note: we listen to events in the capture phase so we can detect them even if the user stops
     // propagation.
-    this._ngZone.runOutsideAngular(() => {
+    Zone.root.run(() => {
       document.addEventListener('keydown', documentKeydownListener, true);
       document.addEventListener('mousedown', documentMousedownListener, true);
       document.addEventListener('touchstart', documentTouchstartListener,