[PresentationAPI] Added on-session-message handler.

content/renderer/presentation/presentation_dispatcher.cc

 // 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.
 
 #include "content/renderer/presentation/presentation_dispatcher.h"
 
 #include "base/logging.h"
 #include "content/common/presentation/presentation_service.mojom.h"
 #include "content/public/common/service_registry.h"
 #include "content/public/renderer/render_frame.h"
@@ skipping 192 matching lines @@
   presentation_service_->ListenForSessionStateChange(base::Bind(
       &PresentationDispatcher::OnSessionStateChange,
       base::Unretained(this)));
 
   DCHECK(!session_info.is_null());
   controller_->didChangeSessionState(
       new PresentationSessionClient(session_info.Pass()),
       GetWebPresentationSessionStateFromMojo(session_state));
 }
 
+void PresentationDispatcher::OnSessionTextMessageReceived(
+    presentation::PresentationSessionInfoPtr session_info,
+    const std::string& message) {
+  if (!controller_)
+    return;
+
+  presentation_service_->ListenForSessionTextMessage(base::Bind(
+      &PresentationDispatcher::OnSessionTextMessageReceived,
+      base::Unretained(this)));
+
+  DCHECK(!session_info.is_null());
+  controller_->didReceiveSessionTextMessage(
+      new PresentationSessionClient(session_info.Pass()),
+      blink::WebString::fromUTF8(message));
+}
+
 void PresentationDispatcher::ConnectToPresentationServiceIfNeeded() {
   if (presentation_service_.get())
     return;
 
   render_frame()->GetServiceRegistry()->ConnectToRemoteService(
       &presentation_service_);
   // TODO(imcheng): Uncomment these once they are implemented on the browser
   // side. (crbug.com/459006)
   /*
   presentation_service_->ListenForDefaultSessionStart(base::Bind(
       &PresentationDispatcher::OnDefaultSessionStarted,
       base::Unretained(this)));
   presentation_service_->ListenForSessionStateChange(base::Bind(
       &PresentationDispatcher::OnSessionStateChange,
       base::Unretained(this)));
+  presentation_service_->ListenForSessionTextMessage(base::Bind(
+      &PresentationDispatcher::OnSessionTextMessageReceived,
+      base::Unretained(this)));
   */
 }
 
 }  // namespace content