style: add missing copyright headers

modules/benchmarks_external/src/tree/react/index.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
+ */
+
 // tree benchmark in React
 import {getIntParameter, bindAction} from '@angular/testing/src/benchmark_util';
 import * as React from './react.min';

modules/benchmarks_external/src/tree/tree_benchmark.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
+ */
+
 // tree benchmark in AngularJS 1.x
 import {getIntParameter, bindAction} from '@angular/testing/src/benchmark_util';
 declare var angular: any;