Upgrade to 1.0 and switch clients to dom-repeat where needed.

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.
--->
+<link rel="import" href="../iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
 
 <script>
 
-  Polymer.IronMenuBehavior = Polymer.IronMultiSelectableBehavior.concat({
+  /**
+   * `Polymer.IronMenuBehavior` implements accessible menu behavior.
+   *
+   * @demo demo/index.html
+   * @polymerBehavior Polymer.IronMenuBehavior
+   */
+  Polymer.IronMenuBehaviorImpl = {
 
     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'
     },
 
+    observers: [
+      '_updateMultiselectable(multi)'
+    ],
+
     listeners: {
       'focus': '_onFocus',
       'keydown': '_onKeydown'
     },
 
+    keyBindings: {
+      'up': '_onUpKey',
+      'down': '_onDownKey',
+      'esc': '_onEscKey',
+      'enter': '_onEnterKey',
+      'shift+tab:keydown': '_onShiftTabDown'
+    },
+
+    _updateMultiselectable: function(multi) {
+      if (multi) {
+        this.setAttribute('aria-multiselectable', 'true');
+      } else {
+        this.removeAttribute('aria-multiselectable');
+      }
+    },
+
+    _onShiftTabDown: function() {
+      var oldTabIndex;
+
+      Polymer.IronMenuBehaviorImpl._shiftTabPressed = true;
+
+      oldTabIndex = this.getAttribute('tabindex');
+
+      this.setAttribute('tabindex', '-1');
+
+      this.async(function() {
+        this.setAttribute('tabindex', oldTabIndex);
+        Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
+      // Note: polymer/polymer#1305
+      }, 1);
+    },
+
+    _applySelection: function(item, isSelected) {
+      if (isSelected) {
+        item.setAttribute('aria-selected', 'true');
+      } else {
+        item.removeAttribute('aria-selected');
+      }
+
+      Polymer.IronSelectableBehavior._applySelection.apply(this, arguments);
+    },
+
     _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);
+    select: function(value) {
+      if (this._defaultFocusAsync) {
+        this.cancelAsync(this._defaultFocusAsync);
+        this._defaultFocusAsync = null;
+      }
+      var item = this._valueToItem(value);
+      this._setFocusedItem(item);
+      Polymer.IronMultiSelectableBehaviorImpl.select.apply(this, arguments);
     },
 
     _onFocus: function(event) {
+      if (Polymer.IronMenuBehaviorImpl._shiftTabPressed) {
+        return;
+      }
+      // do not focus the menu itself
+      this.blur();
       // 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]);
+      this._defaultFocusAsync = this.async(function() {
+        // 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]);
+        }
+      // async 100ms to wait for `select` to get called from `_itemActivate`
+      }, 100);
+    },
+
+    _onUpKey: function() {
+      // up and down arrows moves the focus
+      this._focusPrevious();
+    },
+
+    _onDownKey: function() {
+      this._focusNext();
+    },
+
+    _onEscKey: function() {
+      // esc blurs the control
+      this.focusedItem.blur();
+    },
+
+    _onEnterKey: function(event) {
+      // enter activates the item unless it is disabled
+      this._activateFocused(event.detail.keyboardEvent);
+    },
+
+    _onKeydown: function(event) {
+      if (this.keyboardEventMatchesKeys(event, 'up down esc enter')) {
+        return;
+      }
+
+      // all other keys focus the menu item starting with that character
+      this._focusWithKeyboardEvent(event);
+    },
+
+    _focusWithKeyboardEvent: function(event) {
+      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;
+        }
       }
     },
 
-    _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;
-          }
-        }
+    _activateFocused: function(event) {
+      if (!this.focusedItem.hasAttribute('disabled')) {
+        this._activateHandler(event);
       }
     },
 
     _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]);
     }
 
-  });
+  };
+
+  Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
+
+  /** @polymerBehavior Polymer.IronMenuBehavior */
+  Polymer.IronMenuBehavior = [
+    Polymer.IronMultiSelectableBehavior,
+    Polymer.IronA11yKeysBehavior,
+    Polymer.IronMenuBehaviorImpl
+  ];
 
 </script>