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

content/browser/presentation/presentation_service_impl.h

Index: content/browser/presentation/presentation_service_impl.h
diff --git a/content/browser/presentation/presentation_service_impl.h b/content/browser/presentation/presentation_service_impl.h
index dea2c88c37d89940f495810411836156aac20d6c..251af6932667d9445bf6f207e0a7043f490b86cd 100644
--- a/content/browser/presentation/presentation_service_impl.h
+++ b/content/browser/presentation/presentation_service_impl.h
@@ -8,6 +8,7 @@
 #include <deque>
 #include <map>
 #include <memory>
+#include <set>
 #include <string>
 #include <vector>
 
@@ -171,6 +172,9 @@ class CONTENT_EXPORT PresentationServiceImpl
                  const std::string& presentation_id) override;
   void ListenForSessionMessages(
       blink::mojom::PresentationSessionInfoPtr session) override;
+  void SetPresentationConnection(
+      blink::mojom::PresentationSessionInfoPtr session,
+      blink::mojom::PresentationConnectionPtr connection) override;
 
   // Creates a binding between this object and |request|.
   void Bind(mojo::InterfaceRequest<blink::mojom::PresentationService> request);
@@ -227,13 +231,18 @@ class CONTENT_EXPORT PresentationServiceImpl
   void ListenForConnectionStateChange(
       const PresentationSessionInfo& connection);
 
-  // Passed to embedder's implementation of PresentationServiceDelegate for
-  // later invocation when session messages arrive.
   void OnSessionMessages(
       const content::PresentationSessionInfo& session,
       const ScopedVector<PresentationSessionMessage>& messages,
       bool pass_ownership);
 
+  // A callback registered to OffscreenPresentationManager when
+  // receiver PSImpl inits. Calls |client_| to create a new
+  // PresentationConnection on receiver page.
+  void OnReceiverConnectionAvailable(
+      const content::PresentationSessionInfo& session_info,
+      PresentationConnectionPtr&& controller_connection);
+
   // Associates a JoinSession |callback| with a unique request ID and
   // stores it in a map.
   // Returns a positive value on success.