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

third_party/WebKit/public/platform/modules/presentation/WebPresentationClient.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 WebPresentationClient_h
 #define WebPresentationClient_h
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebCommon.h"
 
@@ skipping 68 matching lines @@
 
     // Stop listening to changes in presentation displays availability. The
     // observer will no longer be notified in case of a change.
     virtual void stopListening(WebPresentationAvailabilityObserver*) = 0;
 
     // Called when a defaultRequest has been set. It sends the url associated
     // with it for the embedder.
     virtual void setDefaultPresentationUrls(const WebVector<WebURL>&) = 0;
 };
 
+class WebPresentationMessageObserver {
+public:
+    // 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 // WebPresentationClient_h