chore(lint): Added license headers to most TypeScript files

Relates to #9380

modules/@angular/platform-browser/testing/benchmark_util.ts

@@ -1,3 +1,11 @@
+/**
+ * @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 {BrowserDomAdapter} from '../src/browser/browser_adapter';
 import {document, window} from '../src/facade/browser';
 import {BaseException} from '../src/facade/exceptions';