chrome/browser/resources/apps_debugger/pack_item_overlay.html

<div id="packItemOverlay" class="page">
  <h1 id="pack-title"></h1>
  <div id="cbd-content-area" class="content-area">
    <div class="pack-item-heading" id="pack-heading"></div>
    <input class="pack-item-text-area" id="item-root-dir" type="hidden">
    <div class="pack-item-text-boxes">
      <div id="item-private-key-label">
        <label i18n-content="packExtensionPrivateKey"></label>
      </div>
      <div id="item-private-key-container">
        <input class="pack-item-text-area" id="item-private-key" type="text"
            disabled>
        <button id="browse-private-key"
            i18n-content="packExtensionBrowseButton"></button>
      </div>
    </div>
  </div>
  <div class="action-area">
    <div class="action-area-right">
      <div class="button-strip">
        <button id="pack-item-dismiss" i18n-content="cancel"></button>
        <button id="pack-item-commit" i18n-content="packButton"></button>
      </div>
    </div>
  </div>
</div>