Submit button added to user pod.

ui/login/account_picker/user_pod_template.html

Index: ui/login/account_picker/user_pod_template.html
diff --git a/ui/login/account_picker/user_pod_template.html b/ui/login/account_picker/user_pod_template.html
index fb0d3992c40d56faaa32e487a4f48c7980b64282..017cda3d5871bcf34582a5b8ba9e9e7221cc7a5f 100644
--- a/ui/login/account_picker/user_pod_template.html
+++ b/ui/login/account_picker/user_pod_template.html
@@ -1,3 +1,15 @@
+<iron-iconset-svg name="user-pod" size="24">
+  <svg>
+    <defs>
+      <!--
+      Inlined from Polymer's iron-icons to avoid importing everything.
+      See http://goo.gl/Y1OdAq for instructions on adding additional icons.
+      -->
+      <g id="arrow-forward"><path d="M12 4l-1.41 1.41L16.17 11H4v2h12.17l-5.58 5.59L12 20l8-8z"/></g>
+    </defs>
+  </svg>
+</iron-iconset-svg>
+
 <div id="user-pod-template" class="pod disabled" hidden>
   <div class="user-image-pane">
     <div class="user-image-container">
@@ -33,6 +45,9 @@
           <img class="capslock-hint"
                src="chrome://theme/IDR_LOGIN_PASSWORD_CAPS_LOCK" alt>
         </div>
+        <paper-icon-button class="submit-button" disabled
+                           icon="user-pod:arrow-forward">
+        </paper-icon-button>
       </div>
       <!-- User Click Authentication -->
       <div class="password-label"></div>