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

chrome/browser/media/router/media_router.mojom

 // 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.
 
 module media_router.interfaces;
 
 // Represents an output sink to which media can be routed.
 struct MediaSink {
   enum IconType {
     CAST,
@@ skipping 188 matching lines @@
   //              media sources.
   // AVAILABLE - A sink is available regardless of source.
   enum SinkAvailability {
     UNAVAILABLE,
     PER_SOURCE,
     AVAILABLE
   };
 
   // Keep in sync with content/public/browser/presentation_session.h.
   enum PresentationConnectionState {
+    CONNECTING,
     CONNECTED,
     CLOSED,
     TERMINATED
   };
 
   // Registers a MediaRouteProvider with the MediaRouter.
   // Returns a string that uniquely identifies the Media Router browser
   // process.
   RegisterMediaRouteProvider(MediaRouteProvider media_router_provider) =>
       (string instance_id);
 
   // Called when the Media Route Manager receives a new list of sinks.
   OnSinksReceived(string media_source, array<MediaSink> sinks);
 
   // Called when issues are reported for media routes.
   OnIssue(Issue issue);
 
   // Called when list of routes has been updated.
   OnRoutesUpdated(array<MediaRoute> routes);
 
   // Called when the overall availability of media sinks has been updated.
   OnSinkAvailabilityUpdated(SinkAvailability availability);
 
   // Called when the state of presentation connected to route |route_id| has
   // changed to |state|.
   OnPresentationConnectionStateChanged(
       string route_id, PresentationConnectionState state);
 };