[Media Router] Add Connecting state to PresentationConnection to bring align with spec

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 89 matching lines @@
 
   /**
    * Converts presentation connection state to Mojo enum value.
    * @param {!string} state
    * @return {!mediaRouterMojom.MediaRouter.PresentationConnectionState}
    */
   function presentationConnectionStateToMojo_(state) {
     var PresentationConnectionState =
         mediaRouterMojom.MediaRouter.PresentationConnectionState;
     switch (state) {
+      case 'connecting':
+        return PresentationConnectionState.CONNECTING;
       case 'connected':
         return PresentationConnectionState.CONNECTED;
       case 'closed':
         return PresentationConnectionState.CLOSED;
       case 'terminated':
         return PresentationConnectionState.TERMINATED;
       default:
         console.error('Unknown presentation connection state: ' + state);
         return PresentationConnectionState.TERMINATED;
     }
@@ skipping 472 matching lines @@
   };
 
   mediaRouter = new MediaRouter(connector.bindHandleToProxy(
       serviceProvider.connectToService(
           mediaRouterMojom.MediaRouter.name),
       mediaRouterMojom.MediaRouter));
 
   return mediaRouter;
 });