Pass error messages from native messaging to web-app.

remoting/host/setup/daemon_controller_delegate_mac.h

 // Copyright 2013 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_SETUP_DAEMON_CONTROLLER_DELEGATE_MAC_H_
 #define REMOTING_HOST_SETUP_DAEMON_CONTROLLER_DELEGATE_MAC_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "remoting/host/setup/daemon_controller.h"
 
 namespace remoting {
 
 class DaemonControllerDelegateMac : public DaemonController::Delegate {
  public:
   DaemonControllerDelegateMac();
   ~DaemonControllerDelegateMac() override;
 
   // DaemonController::Delegate interface.
   DaemonController::State GetState() override;
   scoped_ptr<base::DictionaryValue> GetConfig() override;
   void SetConfigAndStart(
       scoped_ptr<base::DictionaryValue> config,
       bool consent,
-      const DaemonController::CompletionCallback& done) override;
+      const base::Closure& on_done,
+      const DaemonController::ErrorCallback& on_error) override;
   void UpdateConfig(scoped_ptr<base::DictionaryValue> config,
-                    const DaemonController::CompletionCallback& done) override;
-  void Stop(const DaemonController::CompletionCallback& done) override;
+                    const base::Closure& on_done,
+                    const DaemonController::ErrorCallback& on_error) override;
+  void Stop(const base::Closure& on_done,
+            const DaemonController::ErrorCallback& on_error) override;
   DaemonController::UsageStatsConsent GetUsageStatsConsent() override;
 
  private:
   void ShowPreferencePane(const std::string& config_data,
-                          const DaemonController::CompletionCallback& done);
+                          const base::Closure& on_done,
+                          const DaemonController::ErrorCallback& on_error);
   void RegisterForPreferencePaneNotifications(
-      const DaemonController::CompletionCallback &done);
+      const base::Closure& on_done,
+      const DaemonController::ErrorCallback& on_error);
   void DeregisterForPreferencePaneNotifications();
   void PreferencePaneCallbackDelegate(CFStringRef name);
 
-  static bool DoShowPreferencePane(const std::string& config_data);
+  static bool DoShowPreferencePane(
+      const std::string& config_data,
+      const DaemonController::ErrorCallback& on_error);
   static void PreferencePaneCallback(CFNotificationCenterRef center,
                                      void* observer,
                                      CFStringRef name,
                                      const void* object,
                                      CFDictionaryRef user_info);
 
-  DaemonController::CompletionCallback current_callback_;
+  base::Closure on_done_;
+  DaemonController::ErrorCallback on_error_;
 
   DISALLOW_COPY_AND_ASSIGN(DaemonControllerDelegateMac);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SETUP_DAEMON_CONTROLLER_DELEGATE_MAC_H_