[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/paper-item/paper-item-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-behaviors/iron-button-state.html">
+<link rel="import" href="../iron-behaviors/iron-control-state.html">
+
+<!--
+`PaperItemBehavior` is a convenience behavior shared by <paper-item> and
+<paper-icon-item> that manages the shared control states and attributes of
+the items.
+-->
 
 <script>
-
-  /** @polymerBehavior */
-  Polymer.PaperButtonBehaviorImpl = {
-
-    properties: {
-
-      _elevation: {
-        type: Number
-      }
-
-    },
-
-    observers: [
-      '_calculateElevation(focused, disabled, active, pressed, receivedFocusFromKeyboard)'
-    ],
-
+  /** @polymerBehavior Polymer.PaperItemBehavior */
+  Polymer.PaperItemBehaviorImpl = {
     hostAttributes: {
-      role: 'button',
+      role: 'option',
       tabindex: '0'
-    },
-
-    _calculateElevation: function() {
-      var e = 1;
-      if (this.disabled) {
-        e = 0;
-      } else if (this.active || this.pressed) {
-        e = 4;
-      } else if (this.receivedFocusFromKeyboard) {
-        e = 3;
-      }
-      this._elevation = e;
     }
   };
 
   /** @polymerBehavior */
-  Polymer.PaperButtonBehavior = [
+  Polymer.PaperItemBehavior = [
     Polymer.IronButtonState,
     Polymer.IronControlState,
-    Polymer.PaperButtonBehaviorImpl
+    Polymer.PaperItemBehaviorImpl
   ];
-
 </script>