text: // Copyright 2018 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  function setManifestTo(url) {
    clearManifest();
  
    var link = document.createElement('link');
    link.rel = 'manifest';
    link.href = url;
    document.head.appendChild(link);
  }
  function clearManifest() {
    // Clear everything.
    document.head.innerHTML = '';
  }
  