suppress user/password dialog when re-enabling sync

chrome/browser/ui/webui/sync_setup_handler.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 CHROME_BROWSER_UI_WEBUI_SYNC_SETUP_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SYNC_SETUP_HANDLER_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/signin/signin_tracker.h"
@@ skipping 103 matching lines @@
   // error UI.
   void DisplayGaiaLogin(bool fatal_error);
 
   // Displays the GAIA login form with a custom error message (used for errors
   // like "email address already in use by another profile"). No message
   // displayed if |error_message| is empty. Displays fatal error UI if
   // |fatal_error| = true.
   void DisplayGaiaLoginWithErrorMessage(const string16& error_message,
                                         bool fatal_error);
 
+  // Displays spinner-only UI indicating that something is going on in the
+  // background.
+  // TODO(kochi): better to show some message that the user can understand what
+  // is running in the background.
+  void DisplaySpinner();
+
   // Returns true if we're the active login object.
   bool IsActiveLogin() const;
 
   // Initiates a login via the signin manager.
   void TryLogin(const std::string& username,
                 const std::string& password,
                 const std::string& captcha,
                 const std::string& access_code);
 
   // If a wizard already exists, focus it and return true.
@@ skipping 31 matching lines @@
   // Cache of the last name the client attempted to authenticate.
   std::string last_attempted_user_email_;
 
   // The error from the last signin attempt.
   GoogleServiceAuthError last_signin_error_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSetupHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SYNC_SETUP_HANDLER_H_