MDEV-26: Global transaction commit. Intermediate commit.

Now slave records GTID in mysql.rpl_slave_state when applying XID log event.

sql/rpl_rli.h

@@ -307,6 +307,14 @@ public:
   char slave_patternload_file[FN_REFLEN]; 
   size_t slave_patternload_file_size;  
 
+  /*
+    Current GTID being processed.
+    The sub_id gives the binlog order within one domain_id. A zero sub_id
+    means that there is no active GTID.
+  */
+  uint64 gtid_sub_id;
+  rpl_gtid current_gtid;
+
   Relay_log_info(bool is_slave_recovery);
   ~Relay_log_info();
 
@@ -584,4 +592,8 @@ private:
 int init_relay_log_info(Relay_log_info* rli, const char* info_fname);
 
 
+extern const LEX_STRING rpl_gtid_slave_state_table_name;
+extern struct rpl_slave_state rpl_global_gtid_slave_state;
+
+
 #endif /* RPL_RLI_H */