feat(core): make ngprobe tokens pluggable

modules/@angular/router/ng_probe_token.ts

@@ -0,0 +1,16 @@
+/**
+ * @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 {NgProbeToken} from '@angular/platform-browser';
+import {Router} from './src/router';
+
+export const ROUTER_NG_PROBE_PROVIDER = {
+  provide: NgProbeToken,
+  multi: true,
+  useValue: new NgProbeToken('router', Router)
+};