Run bower update

third_party/polymer/components/paper-button/demo/index.html

Index: third_party/polymer/components/paper-button/demo/index.html
diff --git a/third_party/polymer/components/paper-button/demo/index.html b/third_party/polymer/components/paper-button/demo/index.html
index 4f57bd5f8e98db52f1e22005fa9735781c54fae2..c2130909f33333b0e18a49c5d49852727965d446 100644
--- a/third_party/polymer/components/paper-button/demo/index.html
+++ b/third_party/polymer/components/paper-button/demo/index.html
@@ -117,6 +117,22 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         </style>
       </template>
     </demo-snippet>
+
+    <h3>Buttons can be used as a link</h3>
+    <demo-snippet class="centered-demo">
+      <template>
+        <a href="https://www.polymer-project.org/" tabindex="-1">
+          <paper-button raised>Polymer Project</paper-button>
+        </a>
+        <style>
+          a paper-button,
+          a:active paper-button,
+          a:visited paper-button {
+            color: #000;
+          }
+        </style>
+      </template>
+    </demo-snippet>
   </div>
 </body>
 </html>