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

components/browser_sync/profile_sync_service.cc

Index: components/browser_sync/profile_sync_service.cc
diff --git a/components/browser_sync/profile_sync_service.cc b/components/browser_sync/profile_sync_service.cc
index 44c5cdd97e964fc588db245a1cd8e37f569709d2..018dccb57ed258126e39826cda529fd2143c00e4 100644
--- a/components/browser_sync/profile_sync_service.cc
+++ b/components/browser_sync/profile_sync_service.cc
@@ -1961,6 +1961,12 @@ void ProfileSyncService::GoogleSigninSucceeded(const std::string& account_id,
     // Track the fact that we're still waiting for auth to complete.
     is_auth_in_progress_ = true;
   }
+
+  if (oauth2_token_service_->RefreshTokenIsAvailable(account_id)) {
+    // Start sync if the refresh token is already available in the token service
+    // when the authenticated account is set.
+    OnRefreshTokenAvailable(account_id);
+  }
 }
 
 void ProfileSyncService::GoogleSignedOut(const std::string& account_id,