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

third_party/WebKit/public/platform/modules/presentation/WebPresentationController.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 WebPresentationController_h
 #define WebPresentationController_h
 
 #include "public/platform/WebCommon.h"
+#include "public/platform/modules/presentation/WebPresentationClient.h"
 
 namespace blink {
 
-class WebPresentationConnectionClient;
 class WebString;
 enum class WebPresentationConnectionCloseReason;
 enum class WebPresentationConnectionState;
 
 // The delegate Blink provides to WebPresentationClient in order to get updates.
-class BLINK_PLATFORM_EXPORT WebPresentationController {
+class BLINK_PLATFORM_EXPORT WebPresentationController : public WebPresentationMessageObserver {
 public:
     virtual ~WebPresentationController() { }
 
     // Called when the presentation session is started by the embedder using
     // the default presentation URL and id.
     virtual void didStartDefaultSession(WebPresentationConnectionClient*) = 0;
 
     // Called when the state of a session changes.
     virtual void didChangeSessionState(WebPresentationConnectionClient*, WebPresentationConnectionState) = 0;
 
     // Called when a connection closes.
     virtual void didCloseConnection(WebPresentationConnectionClient*, WebPresentationConnectionCloseReason, const WebString& message) = 0;
 
     // Called when a text message of a session is received.
     virtual void didReceiveSessionTextMessage(WebPresentationConnectionClient*, const WebString& message) = 0;
 
     // Called when a binary message of a session is received.
     virtual void didReceiveSessionBinaryMessage(WebPresentationConnectionClient*, const uint8_t* data, size_t length) = 0;
 };
 
 } // namespace blink
 
 #endif // WebPresentationController_h