[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"
 
 class GURL;
 
 namespace content {
 
 class PresentationScreenAvailabilityListener;
 
 using PresentationSessionStartedCallback =
     base::Callback<void(const PresentationSessionInfo&)>;
 using PresentationSessionErrorCallback =
@@ skipping 15 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&)>;
 
-// An interface implemented by embedders to handle presentation API calls
-// forwarded from PresentationServiceImpl.
-class CONTENT_EXPORT PresentationServiceDelegate {
+using PresentationConnectionPtr = blink::mojom::PresentationConnectionPtr;
+
+// This callback will create a receiver PresentationConnectionPtr, and connect
+// it with the passed in controller PresentationConnectionPtr.
+using ReceiverConnectionAvailableCallback =
+    base::Callback<void(const content::PresentationSessionInfo&,
+                        PresentationConnectionPtr&&)>;
+
+// Base class for ControllerPresentationServiceDelegate and
+// ReceiverPresentationServiceDelegate.
+class PresentationServiceDelegateBase {
  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;
 
    protected:
     virtual ~Observer() {}
   };
 
-  using SendMessageCallback = base::Callback<void(bool)>;
-
-  virtual ~PresentationServiceDelegate() {}
-
   // Registers an observer associated with frame with |render_process_id|
   // and |render_frame_id| with this class to listen for updates.
   // This class does not own the observer.
   // It is an error to add an observer if there is already an observer for that
   // frame.
   virtual void AddObserver(int render_process_id,
                            int render_frame_id,
                            Observer* observer) = 0;
 
   // Unregisters the observer associated with the frame with |render_process_id|
   // and |render_frame_id|.
   // The observer will no longer receive updates.
   virtual void RemoveObserver(int render_process_id, int render_frame_id) = 0;
 
+  // Resets the presentation state for the frame given by |render_process_id|
+  // and |render_frame_id|.
+  // This unregisters all listeners associated with the given frame, and clears
+  // the default presentation URL and ID set for the frame.
+  virtual void Reset(int render_process_id, int render_frame_id) = 0;
+};
+
+// An interface implemented by embedders to handle presentation API calls
+// forwarded from PresentationServiceImpl.
+class CONTENT_EXPORT ControllerPresentationServiceDelegate
+    : public PresentationServiceDelegateBase {
+ public:
+  using SendMessageCallback = base::Callback<void(bool)>;
+
+  virtual ~ControllerPresentationServiceDelegate() {}
+
   // Registers |listener| to continuously listen for
   // availability updates for a presentation URL, originated from the frame
   // given by |render_process_id| and |render_frame_id|.
   // This class does not own |listener|.
   // Returns true on success.
   // This call will return false if a listener with the same presentation URL
   // from the same frame is already registered.
   virtual bool AddScreenAvailabilityListener(
       int render_process_id,
       int render_frame_id,
       PresentationScreenAvailabilityListener* listener) = 0;
 
   // Unregisters |listener| originated from the frame given by
   // |render_process_id| and |render_frame_id| from this class. The listener
   // will no longer receive availability updates.
   virtual void RemoveScreenAvailabilityListener(
       int render_process_id,
       int render_frame_id,
       PresentationScreenAvailabilityListener* listener) = 0;
 
-  // Resets the presentation state for the frame given by |render_process_id|
-  // and |render_frame_id|.
-  // This unregisters all listeners associated with the given frame, and clears
-  // the default presentation URL and ID set for the frame.
-  virtual void Reset(
-      int render_process_id,
-      int render_frame_id) = 0;
-
   // Sets the default presentation URLs for frame given by |render_process_id|
   // and |render_frame_id|. When the default presentation is started on this
   // frame, |callback| will be invoked with the corresponding
   // PresentationSessionInfo object.
   // If |default_presentation_urls| is empty, the default presentation URLs will
   // be cleared and the previously registered callback (if any) will be removed.
   virtual void SetDefaultPresentationUrls(
       int render_process_id,
       int render_frame_id,
       const std::vector<GURL>& default_presentation_urls,
@@ skipping 73 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;
+
+  // Connect |connection| owned by the controlling frame to the offscreen
+  // presentation represented by |session|.
+  // |render_process_id|, |render_frame_id|: ID of originating frame.
+  // |connection|: Pointer to controller's presentation connection,
+  // ownership passed from controlling frame to the offscreen presentation.
+  virtual void ConnectToOffscreenPresentation(
+      int render_process_id,
+      int render_frame_id,
+      const PresentationSessionInfo& session,
+      PresentationConnectionPtr connection) = 0;
+};
+
+// An interface implemented by embedders to handle
+// PresentationService calls from a presentation receiver.
+class CONTENT_EXPORT ReceiverPresentationServiceDelegate
+    : public PresentationServiceDelegateBase {
+ public:
+  // Registers a callback from the embedder when an offscreeen presentation has
+  // been successfully started.
+  // |receiver_available_callback|: Invoked when successfully starting a
+  // offscreen presentation session.
+  virtual void RegisterReceiverConnectionAvailableCallback(
+      const content::ReceiverConnectionAvailableCallback&
+          receiver_available_callback) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PRESENTATION_SERVICE_DELEGATE_H_