Roll Polymer to 1.3.1

third_party/polymer/v1_0/components-chromium/iron-menu-behavior/iron-menu-behavior-extracted.js

 /**
    * `Polymer.IronMenuBehavior` implements accessible menu behavior.
    *
    * @demo demo/index.html
    * @polymerBehavior Polymer.IronMenuBehavior
    */
   Polymer.IronMenuBehaviorImpl = {
 
     properties: {
 
@@ skipping 205 matching lines @@
      * Handler that is called when the menu receives focus.
      *
      * @param {FocusEvent} event A focus event.
      */
     _onFocus: function(event) {
       if (Polymer.IronMenuBehaviorImpl._shiftTabPressed) {
         // do not focus the menu itself
         return;
       }
 
+      // Do not focus the selected tab if the deepest target is part of the
+      // menu element's local DOM and is focusable.
+      var rootTarget = /** @type {?HTMLElement} */(
+          Polymer.dom(event).rootTarget);
+      if (rootTarget !== this && typeof rootTarget.tabIndex !== "undefined" && !this.isLightDescendant(rootTarget)) {
+        return;
+      }
+
       this.blur();
 
       // clear the cached focus item
       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;
 
         this._setFocusedItem(null);
 
         if (selectedItem) {
           this._setFocusedItem(selectedItem);
         } else {
           this._setFocusedItem(this.items[0]);
         }
       // async 1ms to wait for `select` to get called from `_itemActivate`
       }, 1);
     },
 
     /**
      * Handler that is called when the up key is pressed.
      *
      * @param {CustomEvent} event A key combination event.
      */
     _onUpKey: function(event) {
       // up and down arrows moves the focus
       this._focusPrevious();
+      event.detail.keyboardEvent.preventDefault();
     },
 
     /**
      * Handler that is called when the down key is pressed.
      *
      * @param {CustomEvent} event A key combination event.
      */
     _onDownKey: function(event) {
       this._focusNext();
+      event.detail.keyboardEvent.preventDefault();
     },
 
     /**
      * Handler that is called when the esc key is pressed.
      *
      * @param {CustomEvent} event A key combination event.
      */
     _onEscKey: function(event) {
       // esc blurs the control
       this.focusedItem.blur();
@@ skipping 20 matching lines @@
   };
 
   Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
 
   /** @polymerBehavior Polymer.IronMenuBehavior */
   Polymer.IronMenuBehavior = [
     Polymer.IronMultiSelectableBehavior,
     Polymer.IronA11yKeysBehavior,
     Polymer.IronMenuBehaviorImpl
   ];