Extend templates and elements for codelab timestamps.

Author: cassierecher

codelab-style.html

@@ -202,6 +202,13 @@
   bottom: 16px;
 }
 
+#last-updated {
+  color: var(--google-codelab-footer-text-color);
+  font-size: 0.9em;
+  position: fixed;
+  bottom: 32px;
+}
+
 #feedback a {
   color: currentcolor;
 }

google-codelab.html

@@ -84,6 +84,12 @@
           </div>
         </template>
 
+        <template is="dom-if" if="{{lastUpdated}}" strip-whitespace>
+          <div id="last-updated">
+            Last updated on <span>{{lastUpdated}}</span>
+          </div>
+        </template>
+
       </div>
 
       <paper-scroll-header-panel id="headerpanel" fixed main>