Add license

Author: kseamon

src/cdk/table/coalesced-style-scheduler.ts

@@ -1,3 +1,11 @@
+/**
+ * @license
+ * Copyright Google LLC 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 {Injectable, NgZone} from '@angular/core';
 import {from, Observable} from 'rxjs';