[MediaRouter] Update MR-2-Extension's PostMessage to return boolean.

chrome/browser/media/router/media_router_mojo_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 CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_MOJO_IMPL_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_MOJO_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 45 matching lines @@
       content::BrowserContext* context,
       mojo::InterfaceRequest<interfaces::MediaRouterObserver> request);
 
   // MediaRouter implementation.
   // Execution of the requests is delegated to the Do* methods, which can be
   // enqueued for later use if the extension is temporarily suspended.
   void CreateRoute(const MediaSource::Id& source_id,
                    const MediaSink::Id& sink_id,
                    const MediaRouteResponseCallback& callback) override;
   void CloseRoute(const MediaRoute::Id& route_id) override;
-  void PostMessage(const MediaRoute::Id& route_id,
-                   const std::string& message) override;
+  void SendMessage(const MediaRoute::Id& route_id,
+                   const std::string& message,
+                   const SendMessageCallback& callback) override;
   void ClearIssue(const Issue::Id& issue_id) override;
   void RegisterMediaSinksObserver(MediaSinksObserver* observer) override;
   void UnregisterMediaSinksObserver(MediaSinksObserver* observer) override;
   void RegisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void UnregisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void AddIssuesObserver(IssuesObserver* observer) override;
   void RemoveIssuesObserver(IssuesObserver* observer) override;
 
   void set_instance_id_for_test(const std::string& instance_id) {
     instance_id_ = instance_id;
@@ skipping 27 matching lines @@
 
   // Dispatches the Mojo requests queued in |pending_requests_|.
   void ExecutePendingRequests();
 
   // These calls invoke methods in the component extension via Mojo.
   void DoCreateRoute(const MediaSource::Id& source_id,
                      const MediaSink::Id& sink_id,
                      const MediaRouteResponseCallback& callback);
   void DoCloseRoute(const MediaRoute::Id& route_id);
   void DoPostMessage(const MediaRoute::Id& route_id,
-                     const std::string& message);
+                     const std::string& message,
+                     const SendMessageCallback& callback);
   void DoClearIssue(const Issue::Id& issue_id);
   void DoStartObservingMediaSinks(const std::string& source_id);
   void DoStopObservingMediaSinks(const std::string& source_id);
   void DoStartObservingMediaRoutes();
   void DoStopObservingMediaRoutes();
   void DoStartObservingIssues();
   void DoStopObservingIssues();
 
   // mojo::ErrorHandler implementation.
   void OnConnectionError() override;
@@ skipping 45 matching lines @@
   std::string instance_id_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterMojoImpl);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_MOJO_IMPL_H_