[PresentationAPI] Added on-session-text-message handler.

Source/modules/presentation/Presentation.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "modules/presentation/Presentation.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 143 matching lines @@
 
 void Presentation::didChangeSessionState(WebPresentationSessionClient* sessionClient, WebPresentationSessionState sessionState)
 {
     PresentationSession* session = findSession(sessionClient);
     if (session)
         session->didChangeState(sessionState);
 
     PresentationSession::dispose(sessionClient);
 }
 
+void Presentation::didReceiveSessionTextMessage(WebPresentationSessionClient* sessionClient, const String& message)
+{
+    PresentationSession* session = findSession(sessionClient);
+    if (session)
+        session->didReceiveTextMessage(message);
+
+    PresentationSession::dispose(sessionClient);
+}
+
 void Presentation::registerSession(PresentationSession* session)
 {
     m_openSessions.add(session);
 }
 
 PresentationController* Presentation::presentationController()
 {
     if (!frame())
         return nullptr;
     return PresentationController::from(*frame());
 }
 
 PresentationSession* Presentation::findSession(WebPresentationSessionClient* sessionClient)
 {
     for (const auto& session : m_openSessions) {
         if (session->matches(sessionClient))
             return session.get();
     }
     return nullptr;
 }
 
 } // namespace blink