[MediaRouter] Add implementation of PresentationServiceDelegate

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 29 matching lines @@
   };
 
   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;
 
+  typedef std::pair<int, int> RenderFrameHostId;

[mark a. foltz, 2015/05/14 22:20:47]

using

+
   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;
@@ skipping 94 matching lines @@
   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_