[Media Router] Add ProvideSinks() Mojo API

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 0373e0363e0e92375d7bf5ee5d1a4306d18261f1..27dbd8e925fd541c4f3121aa9a5f47cd7bd9361c 100644
--- a/extensions/renderer/resources/media_router_bindings.js
+++ b/extensions/renderer/resources/media_router_bindings.js
@@ -10,6 +10,7 @@ define('media_router_bindings', [
     'extensions/common/mojo/keep_alive.mojom',
     'mojo/common/time.mojom',
     'mojo/public/js/bindings',
+    'url/mojo/url.mojom',
 ], function(frameInterfaces,
             mediaRouterMojom,
             keepAliveMojom,
@@ -482,6 +483,11 @@ define('media_router_bindings', [
      * @type {function(!string, !string, !SinkSearchCriteria): !string}
      */
     this.searchSinks = null;
+
+    /**
+     * @type {function()}
+     */
+    this.onSinksDiscovered = null;
   };
 
   /**
@@ -533,6 +539,7 @@ define('media_router_bindings', [
       'enableMdnsDiscovery',
       'updateMediaSinks',
       'searchSinks',
+      'onSinksDiscovered',
       'onBeforeInvokeHandler'
     ];
     requiredHandlers.forEach(function(nextHandler) {
@@ -803,6 +810,16 @@ define('media_router_bindings', [
     });
   };
 
+  /**
+   * Notifies the provider manager that MediaRouter has discovered a list of
+   * sinks.
+   * @param {!Array<!mediaRouterMojom.MediaSink>} sinks
+   */
+  MediaRouteProvider.prototype.onSinksDiscovered = function(sinks) {
+    this.handlers_.onBeforeInvokeHandler();
+    this.handlers_.onSinksDiscovered(sinks);
+  };
+
   mediaRouter = new MediaRouter(new mediaRouterMojom.MediaRouterPtr(
       frameInterfaces.getInterface(mediaRouterMojom.MediaRouter.name)));