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

Relates to #9380

modules/@angular/platform-browser/test/browser/tools/spies.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 {ReflectiveInjector, provide} from '@angular/core';
 import {ApplicationRef, ApplicationRef_} from '@angular/core/src/application_ref';
 import {SpyObject} from '@angular/core/testing/testing_internal';

modules/@angular/platform-browser/test/browser/tools/tools_spec.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, ddescribe, describe, expect, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
 import {disableDebugTools, enableDebugTools} from '@angular/platform-browser';