Pass origin to StartObservingMediaSinks.

extensions/renderer/resources/media_router_bindings.js

Index: extensions/renderer/resources/media_router_bindings.js
diff --git a/extensions/renderer/resources/media_router_bindings.js b/extensions/renderer/resources/media_router_bindings.js
index b6252c50e999fe49cbc08973532b30b1db95939b..48b790fcd924ba64279ad46de37afce3a5828f18 100644
--- a/extensions/renderer/resources/media_router_bindings.js
+++ b/extensions/renderer/resources/media_router_bindings.js
@@ -264,10 +264,22 @@ define('media_router_bindings', [
    * Called by the provider manager when a sink list for a given source is
    * updated.
    * @param {!string} sourceUrn
+   * @param {!string} origin
    * @param {!Array<!MediaSink>} sinks
    */
-  MediaRouter.prototype.onSinksReceived = function(sourceUrn, sinks) {
-    this.service_.onSinksReceived(sourceUrn, sinks.map(sinkToMojo_));
+  MediaRouter.prototype.onSinksReceived = function(
+      sourceUrn, origin, sinks) {
+    if (origin typeof String) {
+      this.service_.onSinksReceived(sourceUrn, origin, sinks.map(sinkToMojo_));
+    } else {
+      /* Provided for backward compatibility if the component extension was
+       * before cl/114586744 when the parameter list only had two parameters:
+       *
+       * @param {!string} sourceUrn
+       * @param {!Array<!MediaSink>} sinks
+       */
+      this.service_.onSinksReceived(sourceUrn, "", origin);
+    }
   };
 
   /**
@@ -530,19 +542,21 @@ define('media_router_bindings', [
    * 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
+   * @param {!string} origin
    */
   MediaRouteProvider.prototype.stopObservingMediaSinks =
-      function(sourceUrn) {
-    this.handlers_.stopObservingMediaSinks(sourceUrn);
+      function(sourceUrn, origin) {
+    this.handlers_.stopObservingMediaSinks(sourceUrn, origin);
   };
 
   /**