Non-Local Join for Media Router and Presentation API

chrome/browser/resources/media_router/elements/route_details/route_details.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="../media_router_header/media_router_header.html">
 <dom-module id="route-details">
   <link rel="import" type="css" href="../../media_router_common.css">
   <link rel="import" type="css" href="route_details.css">
   <template>
     <media-router-header id="route-details-header"
         view="[[currentView_]]" heading-text="[[sink.name]]">
     </media-router-header>
     <div id="route-information" hidden$="[[!isCustomControllerHidden_]]">
       <span>[[activityStatus_]]</span>
     </div>
     <extensionview id="custom-controller"
         hidden$="[[isCustomControllerHidden_]]">
     </extensionview>
+    <paper-button raised id="join-route-button" class="button"

[mark a. foltz, 2015/11/09 19:12:31]

Where is the conditional that determines when this button is shown?

[matt.boetger, 2015/11/09 19:24:35]

I currently am working with Derek to make sure the semantics for this condition
makes sense as is available when the dialog is instantiated.  

+        on-click="joinRoute_">
+      <span>[[joinCastingButtonText_]]</span>
+    </paper-button>
     <paper-button raised id="close-route-button" class="button"
         on-click="closeRoute_">
       <span>[[stopCastingButtonText_]]</span>
     </paper-button>
   </template>
 <script src="route_details.js"></script>
 </dom-module>