Start moving signin code out of browser/sync.

chrome/browser/signin/signin_manager.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.
 //
 // The signin manager encapsulates some functionality tracking
 // which user is signed in. When a user is signed in, a ClientLogin
 // request is run on their behalf. Auth tokens are fetched from Google
 // and the results are stored in the TokenService.
 //
 // **NOTE** on semantics of SigninManager:
@@ skipping 79 matching lines @@
   void ProvideSecondFactorAccessCode(const std::string& access_code);
 
   // Sign a user out, removing the preference, erasing all keys
   // associated with the user, and canceling all auth in progress.
   virtual void SignOut();
 
   // Returns the auth error associated with the last login attempt, or None if
   // there have been no login failures.
   virtual const GoogleServiceAuthError& GetLoginAuthError() const;
 
+  // Returns true if there's a signin in progress.
+  bool AuthInProgress() const;
+
   // GaiaAuthConsumer
   virtual void OnClientLoginSuccess(const ClientLoginResult& result) OVERRIDE;
   virtual void OnClientLoginFailure(
       const GoogleServiceAuthError& error) OVERRIDE;
   virtual void OnGetUserInfoSuccess(const std::string& key,
                                     const std::string& value) OVERRIDE;
   virtual void OnGetUserInfoKeyNotFound(const std::string& key) OVERRIDE;
   virtual void OnGetUserInfoFailure(
       const GoogleServiceAuthError& error) OVERRIDE;
   virtual void OnTokenAuthFailure(const GoogleServiceAuthError& error) OVERRIDE;
@@ skipping 58 matching lines @@
   // The last error we received when logging in (used to retrieve details like
   // captchas, etc).
   GoogleServiceAuthError last_login_auth_error_;
 
   std::string authenticated_username_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninManager);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_H_