[PresentationAPI] Implementing send() from WebPresentationClient to the PresentationService.

content/renderer/presentation/presentation_dispatcher.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 CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_
 #define CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_vector.h"
 #include "content/common/content_export.h"
@@ skipping 23 matching lines @@
       blink::WebPresentationController* controller);
   virtual void updateAvailableChangeWatched(bool watched);
   virtual void startSession(
       const blink::WebString& presentationUrl,
       const blink::WebString& presentationId,
       blink::WebPresentationSessionClientCallbacks* callback);
   virtual void joinSession(
       const blink::WebString& presentationUrl,
       const blink::WebString& presentationId,
       blink::WebPresentationSessionClientCallbacks* callback);
+  virtual void postMessage(
+      const blink::WebString& presentationUrl,
+      const blink::WebString& presentationId,
+      const blink::WebString& message);
   virtual void closeSession(
       const blink::WebString& presentationUrl,
       const blink::WebString& presentationId);
 
   // RenderFrameObserver
   void DidChangeDefaultPresentation() override;
 
   void OnScreenAvailabilityChanged(
       const std::string& presentation_url,
       bool available);
@@ skipping 19 matching lines @@
   // TODO(avayvod): Switch to base::IDMap when the lookup by presentation id is
   // needed.
   using PresentationSessionDispatchers =
       ScopedVector<PresentationSessionDispatcher>;
   PresentationSessionDispatchers presentation_session_dispatchers_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_