[Media Router] Add a supports_web_ui_controller attribute to MediaRoute

chrome/browser/resources/media_router/media_router_data.js

Index: chrome/browser/resources/media_router/media_router_data.js
diff --git a/chrome/browser/resources/media_router/media_router_data.js b/chrome/browser/resources/media_router/media_router_data.js
index 53d5b4cef872f51125164030dc741871128ac450..c3e81b92aacbdacdb7f8e4a0fd62d1b91cdda7c7 100644
--- a/chrome/browser/resources/media_router/media_router_data.js
+++ b/chrome/browser/resources/media_router/media_router_data.js
@@ -193,6 +193,8 @@ cr.define('media_router', function() {
    * @param {boolean} canJoin True if this route can be joined.
    * @param {?string} customControllerPath non-empty if this route has custom
    *                  controller.
+   * @param {boolean} supportsWebUiController Whether the route supports the
+   *                  WebUI controller. If not, then extensionview is used.
    * @constructor
    * @struct
    */
@@ -221,6 +223,9 @@ cr.define('media_router', function() {
 
     /** @type {?string} */
     this.customControllerPath = customControllerPath;
+
+    /** @type {boolean} */
+    this.supportsWebUiController = false;
   };
 
   /**