feat(router): register router with ngprobe

modules/@angular/core/src/application_ref.ts

@@ -60,6 +60,15 @@ export function isDevMode(): boolean {
   return _devMode;
 }
 
+/**
+ * A token for third-party components that can register themselves with NgProbe.
+ *
+ * @experimental
+ */
+export class NgProbeToken {
+  constructor(public name: string, public token: any) {}
+}
+
 /**
  * Creates a platform.
  * Platforms have to be eagerly created via this function.