[Presentation API] Use connection proxy to change connection state to 'closed'

third_party/WebKit/public/platform/modules/presentation/presentation.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.
 
 // TODO(crbug.com/647290): Rename "Session" to "Connection"
 
 module blink.mojom;
 
 import "url/mojo/url.mojom";
 
@@ skipping 45 matching lines @@
 
 interface PresentationConnection {
    // TODO(zhaobin): migrate SendConnectionMessage from PresentationService =>
    // PresentationConnection.Send(). http://crbug.com/658474
 
    // Called when a message is sent by the target connection.
    OnMessage(ConnectionMessage message) => (bool success);
 
    // Called when target connection notifies connection state change.
    DidChangeState(PresentationConnectionState state);
+
+   // Called when target connection calls close().
+   OnClose();
 };
 
 interface PresentationService {
   // Sets the PresentationServiceClient.
   SetClient(PresentationServiceClient client);
 
   ///////////// Functions here are for the controller part of the API. /////////
 
   // Called when the frame sets or changes the default presentation URLs.
   // When the default presentation is started on this frame,
@@ skipping 96 matching lines @@
   OnConnectionMessagesReceived(PresentationSessionInfo sessionInfo,
                             array<ConnectionMessage> messages);
 
   // Called on a presentation receiver when presentation connection is available
   // from the controlling page.
   OnReceiverConnectionAvailable(
       PresentationSessionInfo sessionInfo,
       PresentationConnection controller_connection_ptr,
       PresentationConnection& receiver_connection_request);
 };