Refactor Material Design PDF Viewer toolbar into a single element

chrome/browser/resources/pdf/elements/viewer-pdf-toolbar/viewer-pdf-toolbar.js

+// Copyright 2015 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.
+
+Polymer('viewer-pdf-toolbar', {
+  /**
+   * @type {string}
+   * The title of the PDF document.
+   */
+  docTitle: '',
+
+  /**
+   * @type {number}
+   * The current index of the page being viewed (0-based).
+   */
+  pageIndex: 0,
+
+  /**
+   * @type {number}
+   * The current loading progress of the PDF document (0 - 100).
+   */
+  loadProgress: 0,
+
+  /**
+   * @type {number}
+   * The number of pages in the PDF document.
+   */
+  docLength: 1,
+
+  loadProgressChanged: function() {
+    if (this.loadProgress >= 100)
+      this.$.pageselector.style.visibility = 'visible';
+  },
+
+  selectPageNumber: function() {
+    this.$.pageselector.select();
+  },
+
+  rotateRight: function() {
+    this.fire('rotate-right');
+  },
+
+  toggleBookmarks: function() {
+    this.fire('toggle-bookmarks');
+  },
+
+  save: function() {
+    this.fire('save');
+  },
+
+  print: function() {
+    this.fire('print');
+  }
+});