[Presentation API] (alternative) 1-UA: send message between controller and receiver page

third_party/WebKit/public/platform/modules/presentation/presentation.mojom

Index: third_party/WebKit/public/platform/modules/presentation/presentation.mojom
diff --git a/third_party/WebKit/public/platform/modules/presentation/presentation.mojom b/third_party/WebKit/public/platform/modules/presentation/presentation.mojom
index 0427db2c60e7d0709b13a1b4b2bbbeea73563084..2cec650cc8a4d2cd02740072b4f42795bba9ec26 100644
--- a/third_party/WebKit/public/platform/modules/presentation/presentation.mojom
+++ b/third_party/WebKit/public/platform/modules/presentation/presentation.mojom
@@ -52,6 +52,16 @@ struct SessionMessage {
   array<uint8>? data;
 };
 
+interface PresentationConnection {
+   // Called to set the PresentationConnection interface that sends
+   // messages in the opposite direction.
+   SetTargetConnection(PresentationConnection connection);
+
+   // Called when connection.send() is invoked at the other end of the
+   // connection.
+   OnSessionMessageReceived(SessionMessage message);
+};
+
 interface PresentationService {
   // Sets the PresentationServiceClient.
   SetClient(PresentationServiceClient client);
@@ -109,6 +119,9 @@ interface PresentationService {
   // PresentationServiceClient::OnSessionMessagesReceived.
   // This is called after a presentation session is created.
   ListenForSessionMessages(PresentationSessionInfo sessionInfo);
+
+  SetPresentationConnection(PresentationSessionInfo sessionInfo,
+                            PresentationConnection connection);
 };
 
 interface PresentationServiceClient {
@@ -143,5 +156,6 @@ interface PresentationServiceClient {
   OnDefaultSessionStarted(PresentationSessionInfo sessionInfo);
 
   // See PresentationService::ListeningForReceiverPageRendered.
-  OnReceiverConnectionAvailable(PresentationSessionInfo sessionInfo);
+  OnReceiverConnectionAvailable(PresentationSessionInfo sessionInfo,
+                                PresentationConnection connection);
 };