Roll Polymer to 1.3.1

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

Index: third_party/polymer/v1_0/components-chromium/iron-menu-behavior/iron-menu-behavior-extracted.js
diff --git a/third_party/polymer/v1_0/components-chromium/iron-menu-behavior/iron-menu-behavior-extracted.js b/third_party/polymer/v1_0/components-chromium/iron-menu-behavior/iron-menu-behavior-extracted.js
index fd0cdc52a0edaeb109a874f306a5ad2e5fe61662..cfdf031fc0d74323d92f7b343795943d235baedb 100644
--- a/third_party/polymer/v1_0/components-chromium/iron-menu-behavior/iron-menu-behavior-extracted.js
+++ b/third_party/polymer/v1_0/components-chromium/iron-menu-behavior/iron-menu-behavior-extracted.js
@@ -223,6 +223,14 @@
         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
@@ -250,6 +258,7 @@
     _onUpKey: function(event) {
       // up and down arrows moves the focus
       this._focusPrevious();
+      event.detail.keyboardEvent.preventDefault();
     },
 
     /**
@@ -259,6 +268,7 @@
      */
     _onDownKey: function(event) {
       this._focusNext();
+      event.detail.keyboardEvent.preventDefault();
     },
 
     /**