[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/paper-item/paper-item-shared-styles.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="../iron-flex-layout/iron-flex-layout.html">
+<link rel="import" href="../paper-styles/default-theme.html">
+<link rel="import" href="../paper-styles/color.html">
+
+<dom-module id="paper-item-shared-styles">
+  <template>
+    <style>
+      :host {
+        display: block;
+        position: relative;
+        min-height: var(--paper-item-min-height, 48px);
+        padding: 0px 16px;
+      }
+
+      :host([hidden]) {
+        display: none !important;
+      }
+
+      :host(.iron-selected) {
+        font-weight: var(--paper-item-selected-weight, bold);
+
+        @apply(--paper-item-selected);
+      }
+
+      :host([disabled]) {
+        color: var(--paper-item-disabled-color, --disabled-text-color);
+
+        @apply(--paper-item-disabled);
+      }
+
+      :host(:focus) {
+        position: relative;
+        outline: 0;
+
+        @apply(--paper-item-focused);
+      }
+
+      :host(:focus):before {
+        @apply(--layout-fit);
+
+        background: currentColor;
+        content: '';
+        opacity: var(--dark-divider-opacity);
+        pointer-events: none;
+
+        @apply(--paper-item-focused-before);
+      }
+    </style>
+  </template>
+</dom-module>