Moving It2Me confirmation prompt into the Validation callback flow

remoting/host/it2me/it2me_confirmation_dialog.h

 // Copyright 2014 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_IT2ME_IT2ME_CONFIRMATION_DIALOG_H_
 #define REMOTING_HOST_IT2ME_IT2ME_CONFIRMATION_DIALOG_H_
 
 #include <memory>
 
 #include "base/callback_forward.h"
@@ skipping 12 matching lines @@
     OK,
     CANCEL
   };
 
   typedef base::Callback<void(Result)> ResultCallback;
 
   virtual ~It2MeConfirmationDialog() {}
 
   // Shows the dialog. |callback| will be called with the user's selection.
   // |callback| will not be called if the dialog is destroyed.
-  virtual void Show(const ResultCallback& callback) = 0;
+  virtual void Show(const std::string& remote_user_email,
+                    const ResultCallback& callback) = 0;
 };
 
 // Used to create an platform specific instance of It2MeConfirmationDialog.
 class It2MeConfirmationDialogFactory {
  public:
   It2MeConfirmationDialogFactory();
   virtual ~It2MeConfirmationDialogFactory();
 
   virtual std::unique_ptr<It2MeConfirmationDialog> Create();
 
   DISALLOW_COPY_AND_ASSIGN(It2MeConfirmationDialogFactory);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_IT2ME_IT2ME_CONFIRMATION_DIALOG_H_