Pass origin to StartObservingMediaSinks.

extensions/renderer/resources/media_router_bindings.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var mediaRouter;
 
 define('media_router_bindings', [
     'mojo/public/js/bindings',
     'mojo/public/js/core',
     'content/public/renderer/service_provider',
@@ skipping 438 matching lines @@
         console.error(nextHandler + ' handler not registered.');
       }
     });
   }
 
   /**
    * Starts querying for sinks capable of displaying the media source
    * designated by |sourceUrn|.  Results are returned by calling
    * OnSinksReceived.
    * @param {!string} sourceUrn
+   * @param {!string} origin
    */
   MediaRouteProvider.prototype.startObservingMediaSinks =
-      function(sourceUrn) {
-    this.handlers_.startObservingMediaSinks(sourceUrn);
+      function(sourceUrn, origin) {
+    this.handlers_.startObservingMediaSinks(sourceUrn, origin);
   };
 
   /**
    * Stops querying for sinks capable of displaying |sourceUrn|.
    * @param {!string} sourceUrn
    */
   MediaRouteProvider.prototype.stopObservingMediaSinks =
       function(sourceUrn) {
     this.handlers_.stopObservingMediaSinks(sourceUrn);
   };
@@ skipping 169 matching lines @@
   };
 
   mediaRouter = new MediaRouter(connector.bindHandleToProxy(
       serviceProvider.connectToService(
           mediaRouterMojom.MediaRouter.name),
       mediaRouterMojom.MediaRouter));
 
   return mediaRouter;
 });