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

Relates to #9380

modules/@angular/examples/testing/ts/fake_async.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 {clearPendingTimers, describe, expect, fakeAsync, it, tick} from '@angular/core/testing';
 
 

modules/@angular/examples/testing/ts/matchers.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 {expect} from '@angular/core/testing';
 
 var value: any;

modules/@angular/examples/testing/ts/testing.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 {afterEach, beforeEach, beforeEachProviders, describe, inject, it, xdescribe, xit} from '@angular/core/testing/testing_internal';
 
 var db: any;