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

content/public/browser/presentation_service_delegate.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_PRESENTATION_SERVICE_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_PRESENTATION_SERVICE_DELEGATE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/scoped_vector.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/presentation_session.h"
 #include "content/public/browser/presentation_session_message.h"
+#include "third_party/WebKit/public/platform/modules/presentation/presentation.mojom.h"
 
 namespace content {
 
 class PresentationScreenAvailabilityListener;
 
 using PresentationSessionStartedCallback =
     base::Callback<void(const PresentationSessionInfo&)>;
 using PresentationSessionErrorCallback =
     base::Callback<void(const PresentationError&)>;
 
@@ skipping 13 matching lines @@
   PresentationConnectionState state;
 
   // |close_reason| and |messsage| are only used for state change to CLOSED.
   PresentationConnectionCloseReason close_reason;
   std::string message;
 };
 
 using PresentationConnectionStateChangedCallback =
     base::Callback<void(const PresentationConnectionStateChangeInfo&)>;
 
+using PresentationConnectionPtr = blink::mojom::PresentationConnectionPtr;
+
+using ReceiverConnectionAvailableCallback =
+    base::Callback<void(const content::PresentationSessionInfo&,
+                        PresentationConnectionPtr&&)>;
+
 // An interface implemented by embedders to handle presentation API calls
 // forwarded from PresentationServiceImpl.
 class CONTENT_EXPORT PresentationServiceDelegate {
  public:
   // Observer interface to listen for changes to PresentationServiceDelegate.
   class CONTENT_EXPORT Observer {
    public:
     // Called when the PresentationServiceDelegate is being destroyed.
     virtual void OnDelegateDestroyed() = 0;
 
@@ skipping 136 matching lines @@
   // frame.
   // |render_process_id|, |render_frame_id|: ID of frame.
   // |connection|: PresentationConnection to listen for state changes.
   // |state_changed_cb|: Invoked with the PresentationConnection and its new
   // state whenever there is a state change.
   virtual void ListenForConnectionStateChange(
       int render_process_id,
       int render_frame_id,
       const PresentationSessionInfo& connection,
       const PresentationConnectionStateChangedCallback& state_changed_cb) = 0;
+
+  // In receiverPSDImpl, register receiver_available_callback with
+  // OffscreenPresentationManager;
+  // In controllerPSDImpl, no-op.
+  // |receiver_available_callback|: Invoked when successfully starting a
+  // offscreen presentation session.
+  virtual void RegisterReceiverAvailableCallback(
+      const content::ReceiverConnectionAvailableCallback&
+          receiver_available_callback) = 0;
+
+  // In receiverPSDImpl, no-op;
+  // In controllerPSDImpl, register controller presentation connection mojo
+  // object to OffscreenPresentationManager (OPM).
+  // |render_process_id|, |render_frame_id|: ID of originating frame.
+  // |connection|: Pointer to controller presentation connection,
+  // pass ownership to OPM. To be used in
+  // offscreen_presentation_manager->RegisterOffscreenPresentationController().
+  virtual void RegisterOffscreenPresentationConnection(
+      int render_process_id,
+      int render_frame_id,
+      const PresentationSessionInfo& session,
+      PresentationConnectionPtr connection) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PRESENTATION_SERVICE_DELEGATE_H_