Pass error messages from native messaging to web-app.

remoting/host/setup/host_starter.h

 // Copyright (c) 2012 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 REMOTING_HOST_HOST_STARTER
 #define REMOTING_HOST_HOST_STARTER
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 59 matching lines @@
   void OnOAuthError() override;
   void OnNetworkError(int response_code) override;
 
  private:
   HostStarter(scoped_ptr<gaia::GaiaOAuthClient> oauth_client,
               scoped_ptr<remoting::ServiceClient> service_client,
               scoped_refptr<remoting::DaemonController> daemon_controller);
 
   void StartHostProcess();
 
-  void OnHostStarted(DaemonController::AsyncResult result);
+  void OnStartHostSucceeded();
+  void OnStartHostFailed(const std::string& error_message,
+                         const tracked_objects::Location& location);
 
   scoped_ptr<gaia::GaiaOAuthClient> oauth_client_;
   scoped_ptr<remoting::ServiceClient> service_client_;
   scoped_refptr<remoting::DaemonController> daemon_controller_;
   gaia::OAuthClientInfo oauth_client_info_;
   std::string host_name_;
   std::string host_pin_;
   bool consent_to_data_collection_;
   CompletionCallback on_done_;
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
@@ skipping 11 matching lines @@
 
   base::WeakPtr<HostStarter> weak_ptr_;
   base::WeakPtrFactory<HostStarter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HostStarter);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_STARTER