Rerun reproduce.sh and pick up some missing elements with git add -f.

third_party/polymer/v0_8/components/iron-menu-behavior/iron-menu-behavior.html

+<!--
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="../iron-selector/iron-multi-selectable.html">
+
+<!--
+`Polymer.IronMenuBehavior` implements accessible menu behavior.
+-->
+
+<script>
+
+  Polymer.IronMenuBehavior = Polymer.IronMultiSelectableBehavior.concat({
+
+    properties: {
+
+      /**
+       * Returns the currently focused item.
+       *
+       * @attribute focusedItem
+       * @type Object
+       */
+      focusedItem: {
+        observer: '_focusedItemChanged',
+        readOnly: true,
+        type: Object
+      },
+
+      /**
+       * The attribute to use on menu items to look up the item title. Typing the first
+       * letter of an item when the menu is open focuses that item. If unset, `textContent`
+       * will be used.
+       *
+       * @attribute attrForItemTitle
+       * @type String
+       */
+      attrForItemTitle: {
+        type: String
+      }
+
+    },
+
+    observers: [
+      '_selectedItemsChanged(selectedItems)',
+      '_selectedItemChanged(selectedItem)'
+    ],
+
+    hostAttributes: {
+      'role': 'menu',
+      'tabindex': '0'
+    },
+
+    listeners: {
+      'focus': '_onFocus',
+      'keydown': '_onKeydown'
+    },
+
+    _focusedItemChanged: function(focusedItem, old) {
+      old && old.setAttribute('tabindex', '-1');
+      if (focusedItem) {
+        focusedItem.setAttribute('tabindex', '0');
+        focusedItem.focus();
+      }
+    },
+
+    _selectedItemsChanged: function(selectedItems) {
+      this._setFocusedItem(selectedItems[0]);
+    },
+
+    _selectedItemChanged: function(selectedItem) {
+      this._setFocusedItem(selectedItem);
+    },
+
+    _onFocus: function(event) {
+      // clear the cached focus item
+      this._setFocusedItem(null);
+      // focus the selected item when the menu receives focus, or the first item
+      // if no item is selected
+      var selectedItem = this.multi ? (this.selectedItems && this.selectedItems[0]) : this.selectedItem;
+      if (selectedItem) {
+        this._setFocusedItem(selectedItem);
+      } else {
+        this._setFocusedItem(this.items[0]);
+      }
+    },
+
+    _onKeydown: function(event) {
+      // FIXME want to define these somewhere, core-a11y-keys?
+      var DOWN = 40;
+      var UP = 38;
+      var ESC = 27;
+      var ENTER = 13;
+      if (event.keyCode === DOWN) {
+        // up and down arrows moves the focus
+        this._focusNext();
+      } else if (event.keyCode === UP) {
+        this._focusPrevious();
+      } else if (event.keyCode === ESC) {
+        // esc blurs the control
+        this.focusedItem.blur();
+      } else if (event.keyCode === ENTER) {
+        // enter activates the item unless it is disabled
+        if (!this.focusedItem.hasAttribute('disabled')) {
+          this._activateHandler(event);
+        }
+      } else {
+        // all other keys focus the menu item starting with that character
+        for (var i = 0, item; item = this.items[i]; i++) {
+          var attr = this.attrForItemTitle || 'textContent';
+          var title = item[attr] || item.getAttribute(attr);
+          if (title && title.trim().charAt(0).toLowerCase() === String.fromCharCode(event.keyCode).toLowerCase()) {
+            this._setFocusedItem(item);
+            break;
+          }
+        }
+      }
+    },
+
+    _focusPrevious: function() {
+      var length = this.items.length;
+      var index = (Number(this.indexOf(this.focusedItem)) - 1 + length) % length;
+      this._setFocusedItem(this.items[index]);
+    },
+
+    _focusNext: function() {
+      var index = (Number(this.indexOf(this.focusedItem)) + 1) % this.items.length;
+      this._setFocusedItem(this.items[index]);
+    }
+
+  });
+
+</script>