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

third_party/WebKit/public/platform/modules/presentation/WebPresentationConnectionClient.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 WebPresentationConnectionClient_h
 #define WebPresentationConnectionClient_h
 
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 
 namespace blink {
 
+class WebPresentationConnectionProxy;
+
 enum class WebPresentationConnectionState {
   Connected = 0,
   Closed,
   Terminated,
 };
 
 enum class WebPresentationConnectionCloseReason { Error = 0, Closed, WentAway };
 
 // The implementation the embedder has to provide for the Presentation API to
 // work.
 class WebPresentationConnectionClient {
  public:
   virtual ~WebPresentationConnectionClient() {}
 
   virtual WebString getId() = 0;
   virtual WebURL getUrl() = 0;
+  virtual WebPresentationConnectionProxy* getOrCreateProxy() = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebPresentationConnectionClient_h