[Media Router] Add a supports_web_ui_controller attribute to MediaRoute

chrome/renderer/resources/extensions/media_router_bindings.js

Index: chrome/renderer/resources/extensions/media_router_bindings.js
diff --git a/chrome/renderer/resources/extensions/media_router_bindings.js b/chrome/renderer/resources/extensions/media_router_bindings.js
index bb083b58bf58028b24a00e0bd34f0942ac01e9ae..f001ed3fd7a7b367e2122de44d326c23c1f2e188 100644
--- a/chrome/renderer/resources/extensions/media_router_bindings.js
+++ b/chrome/renderer/resources/extensions/media_router_bindings.js
@@ -85,9 +85,11 @@ define('media_router_bindings', [
       'custom_controller_path': route.customControllerPath,
       // Begin newly added properties, followed by the milestone they were
       // added.  The guard should be safe to remove N+2 milestones later.
-      'for_display': route.forDisplay, // M47
-      'is_incognito': !!route.offTheRecord,  // M50
-      'is_offscreen_presentation': !!route.isOffscreenPresentation // M56
+      'for_display': route.forDisplay,                               // M47
+      'is_incognito': !!route.offTheRecord,                          // M50
+      'is_offscreen_presentation': !!route.isOffscreenPresentation,  // M56
+      'supports_media_route_controller':
+          !!route.supportsMediaRouteController  // M61
     });
   }