[PresentationAPI] Implementing send() from WebPresentationClient to the PresentationService.

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 <vector>
 
 #include "base/callback.h"
@@ skipping 27 matching lines @@
    protected:
     virtual ~Observer() {}
   };
 
   using PresentationSessionSuccessCallback =
       base::Callback<void(const PresentationSessionInfo&)>;
   using PresentationSessionErrorCallback =
       base::Callback<void(const PresentationError&)>;
   using PresentationSessionMessageCallback = base::Callback<void(
       scoped_ptr<ScopedVector<PresentationSessionMessage>>)>;
+  using SendMessageCallback = base::Closure;
 
   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,
@@ skipping 79 matching lines @@
       const PresentationSessionSuccessCallback& success_cb,
       const PresentationSessionErrorCallback& error_cb) = 0;
 
   // Gets the next batch of messages from all presentation sessions in the frame
   // |render_process_id|, |render_frame_id|: ID for originating frame.
   // |message_cb|: Invoked with a non-empty list of messages.
   virtual void ListenForSessionMessages(
       int render_process_id,
       int render_frame_id,
       const PresentationSessionMessageCallback& message_cb) = 0;
+
+  // Sends a message (string or binary data) to a presentation session.
+  // |render_process_id|, |render_frame_id|: ID of originating frame.
+  // |message_request|: Contains Presentation URL, ID and message to be sent
+  // and delegate is responsible for deallocating the message_request.
+  // |send_message_cb|: Invoked after handling the send message request.
+  virtual void SendMessage(
+      int render_process_id,
+      int render_frame_id,
+      scoped_ptr<PresentationSessionMessage> message_request,
+      const SendMessageCallback& send_message_cb) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PRESENTATION_SERVICE_DELEGATE_H_