message: add the license to the new file
diff: +// Licensed to the Software Freedom Conservancy (SFC) under one
  +// or more contributor license agreements. See the NOTICE file
  +// distributed with this work for additional information
  +// regarding copyright ownership. The SFC licenses this file
  +// to you under the Apache License, Version 2.0 (the
  +// "License"); you may not use this file except in compliance
  +// with the License. You may obtain a copy of the License at
  +//
  +// http://www.apache.org/licenses/LICENSE-2.0
  +//
  +// Unless required by applicable law or agreed to in writing,
  +// software distributed under the License is distributed on an
  +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  +// KIND, either express or implied. See the License for the
  +// specific language governing permissions and limitations
  +// under the License.
  +
  /*eslint-disable no-undef*/
  goog.require("goog.dom");
  