[DICE] Enable sync for an account that is already present in the token service.

components/signin/core/browser/signin_manager.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.
 //
 // The signin manager encapsulates some functionality tracking
 // which user is signed in. See SigninManagerBase for full description of
 // responsibilities. The class defined in this file provides functionality
 // required by all platforms except Chrome OS.
 //
 // When a user is signed in, a ClientLogin request is run on their behalf.
@@ skipping 56 matching lines @@
                 ProfileOAuth2TokenService* token_service,
                 AccountTrackerService* account_tracker_service,
                 GaiaCookieManagerService* cookie_manager_service);
   ~SigninManager() override;
 
   // Returns true if the username is allowed based on the policy string.
   static bool IsUsernameAllowedByPolicy(const std::string& username,
                                         const std::string& policy);
 
   // Attempt to sign in this user with a refresh token.
+  // If |refresh_token| is not empty, then SigninManager will add it to the
+  // |token_service_| when the sign-in flow is completed.
   // If non-null, the passed |oauth_fetched_callback| callback is invoked once
-  // signin has been completed.
+  // sign-in has been completed.
   // The callback should invoke SignOut() or CompletePendingSignin() to either
   // continue or cancel the in-process signin.
   virtual void StartSignInWithRefreshToken(
       const std::string& refresh_token,
       const std::string& gaia_id,
       const std::string& username,
       const std::string& password,
       const OAuthTokenFetchedCallback& oauth_fetched_callback);
 
   // Copies auth credentials from one SigninManager to this one. This is used
@@ skipping 56 matching lines @@
 
  protected:
   // Flag saying whether signing out is allowed.
   bool prohibit_signout_;
 
   // The sign out process which is started by SigninClient::PreSignOut()
   virtual void DoSignOut(signin_metrics::ProfileSignout signout_source_metric,
                          signin_metrics::SignoutDelete signout_delete_metric);
 
  private:
-  enum SigninType { SIGNIN_TYPE_NONE, SIGNIN_TYPE_WITH_REFRESH_TOKEN };
+  enum SigninType {
+    SIGNIN_TYPE_NONE,
+    SIGNIN_TYPE_WITH_REFRESH_TOKEN,
+    SIGNIN_TYPE_WITHOUT_REFRESH_TOKEN
+  };
 
   std::string SigninTypeToString(SigninType type);
   friend class FakeSigninManager;
   FRIEND_TEST_ALL_PREFIXES(SigninManagerTest, ClearTransientSigninData);
   FRIEND_TEST_ALL_PREFIXES(SigninManagerTest, ProvideSecondFactorSuccess);
   FRIEND_TEST_ALL_PREFIXES(SigninManagerTest, ProvideSecondFactorFailure);
 
   // If user was signed in, load tokens from DB if available.
   void InitTokenService();
 
@@ skipping 75 matching lines @@
   bool user_info_fetched_by_account_tracker_;
 
   base::WeakPtrFactory<SigninManager> weak_pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninManager);
 };
 
 #endif  // !defined(OS_CHROMEOS)
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_MANAGER_H_