[Presentation API] (4th)(1-UA blink side) Add WebPresentationConnection and WebPresentationConnecti…

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 44 matching lines @@
 
 interface PresentationConnection {
    // TODO(zhaobin): migrate SendSessionMessage from PresentationService =>
    // PresentationConnection.Send(). http://crbug.com/658474
 
    // Called to set the PresentationConnection that is the destination for
    // messages sent and the source of messages received by this connection.
    SetTargetConnection(PresentationConnection connection);
 
    // Called when a message is sent by the target connection.
-   OnMessage(SessionMessage message);
+   OnMessage(SessionMessage message) => (bool success);
+
+   // Called when target connection notifies connection state change.
+   DidChangeState(PresentationConnectionState state);
 };
 
 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 85 matching lines @@
   // See PresentationService::ListenForSessionMessages.
   OnSessionMessagesReceived(PresentationSessionInfo sessionInfo,
                             array<SessionMessage> messages);
 
   // See PresentationService::SetDefaultPresentationURL.
   OnDefaultSessionStarted(PresentationSessionInfo sessionInfo);
 
   // See PresentationService::ListeningForReceiverPageRendered.
   OnReceiverConnectionAvailable(PresentationSessionInfo sessionInfo);
 };