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

chrome/browser/policy/cloud/user_policy_signin_service.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_POLICY_CLOUD_USER_POLICY_SIGNIN_SERVICE_H_
 #define CHROME_BROWSER_POLICY_CLOUD_USER_POLICY_SIGNIN_SERVICE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 29 matching lines @@
       SigninManager* signin_manager,
       scoped_refptr<net::URLRequestContextGetter> system_request_context,
       ProfileOAuth2TokenService* oauth2_token_service);
   ~UserPolicySigninService() override;
 
   // Registers a CloudPolicyClient for fetching policy for a user. The
   // |oauth2_login_token| and |username| are explicitly passed because
   // the user is not signed in yet (ProfileOAuth2TokenService does not have
   // any tokens yet to prevent services from using it until after we've fetched
   // policy).
-  void RegisterForPolicy(const std::string& username,
-                         const std::string& oauth2_login_token,
-                         const PolicyRegistrationCallback& callback);
+  void RegisterForPolicyWithLoginToken(
+      const std::string& username,
+      const std::string& oauth2_login_token,
+      const PolicyRegistrationCallback& callback);
+
+  // Registers a CloudPolicyClient for fetching policy for a user. |username| is
+  // explicitly passed because the user is not yet authenticated, but the token
+  // service has a refresh token available for |account_id|.
+  void RegisterForPolicyWithAccountId(
+      const std::string& username,
+      const std::string& account_id,
+      const PolicyRegistrationCallback& callback);
 
   // OAuth2TokenService::Observer implementation:
   void OnRefreshTokenAvailable(const std::string& account_id) override;
 
   // CloudPolicyService::Observer implementation:
   void OnInitializationCompleted(CloudPolicyService* service) override;
 
   // KeyedService implementation:
   void Shutdown() override;
 
@@ skipping 32 matching lines @@
   // Weak pointer to the token service we use to authenticate during
   // CloudPolicyClient registration.
   ProfileOAuth2TokenService* oauth2_token_service_;
 
   DISALLOW_COPY_AND_ASSIGN(UserPolicySigninService);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CLOUD_USER_POLICY_SIGNIN_SERVICE_H_