ChromeOS: should send old user GAPS cookie to GAIA on user reauthentication.

components/user_manager/user_manager_base.h

Index: components/user_manager/user_manager_base.h
diff --git a/components/user_manager/user_manager_base.h b/components/user_manager/user_manager_base.h
index d8454efa620387eddf02c6e8fa3bc3cc7a06d9ea..0799fb3685c6592a725278dccacd0f10a96d3a0e 100644
--- a/components/user_manager/user_manager_base.h
+++ b/components/user_manager/user_manager_base.h
@@ -137,6 +137,9 @@ class USER_MANAGER_EXPORT UserManagerBase : public UserManager {
   void SetKnownUserDeviceId(const UserID& user_id,
                             const std::string& device_id) override;
   std::string GetKnownUserDeviceId(const UserID& user_id) override;
+  void SetKnownUserGAPSCookie(const UserID& user_id,
+                              const std::string& gaps_cookie) override;
+  std::string GetKnownUserGAPSCookie(const UserID& user_id) override;
   void UpdateReauthReason(const std::string& user_id,
                           const int reauth_reason) override;
   bool FindReauthReason(const std::string& user_id, int* out_value) override;