[PresentationAPI] Added on-session-message handler.

content/browser/presentation/presentation_service_impl.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_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_
 #define CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
@@ skipping 46 matching lines @@
   using ScreenAvailabilityMojoCallback =
       mojo::Callback<void(mojo::String, bool)>;
   using NewSessionMojoCallback =
       mojo::Callback<void(presentation::PresentationSessionInfoPtr,
           presentation::PresentationErrorPtr)>;
   using DefaultSessionMojoCallback =
       mojo::Callback<void(presentation::PresentationSessionInfoPtr)>;
   using SessionStateCallback =
       mojo::Callback<void(presentation::PresentationSessionInfoPtr,
           presentation::PresentationSessionState)>;
+  using SessionMessagesCallback =
+      mojo::Callback<void(mojo::Array<presentation::SessionMessagePtr>)>;
 
   // A helper data class used by PresentationServiceImpl to do bookkeeping
   // of currently registered screen availability listeners.
   // An instance of this class is a simple state machine that waits for both
   // the available bit and the Mojo callback to become available.
   // Once this happens, the Mojo callback will be invoked with the available
   // bit, and the state machine will reset.
   // The available bit is obtained from the embedder's media router.
   // The callback is obtained from the renderer via PresentationServiceImpl's
   // ListenForScreenAvailability().
@@ skipping 123 matching lines @@
       const NewSessionMojoCallback& callback) override;
   void JoinSession(
       const mojo::String& presentation_url,
       const mojo::String& presentation_id,
       const NewSessionMojoCallback& callback) override;
   void CloseSession(
       const mojo::String& presentation_url,
       const mojo::String& presentation_id) override;
   void ListenForSessionStateChange(
       const SessionStateCallback& callback) override;
+  void ListenForSessionMessages(
+      const SessionMessagesCallback& callback) override;
 
   // Creates a binding between this object and |request|.
   void Bind(mojo::InterfaceRequest<presentation::PresentationService> request);
 
   // mojo::ErrorHandler override.
   // Note that this is called when the RenderFrameHost is deleted.
   void OnConnectionError() override;
 
   // WebContentsObserver override.
   void DidNavigateAnyFrame(
@@ skipping 100 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<PresentationServiceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PresentationServiceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_