Add a simple Job queue in default port. (#1685)

Job queue (event loop) is the basis of Promise. Each port should implement their own job queue.

JerryScript-DCO-1.0-Signed-off-by: Zidong Jiang zidong.jiang@intel.com

targets/default/jerry-port-default.h

@@ -16,6 +16,7 @@
 #ifndef JERRY_PORT_DEFAULT_H
 #define JERRY_PORT_DEFAULT_H
 
+#include "jerryscript.h"
 #include "jerry-port.h"
 
 #include <stdbool.h>
@@ -36,6 +37,11 @@ bool jerry_port_default_is_abort_on_fail (void);
 jerry_log_level_t jerry_port_default_get_log_level (void);
 void jerry_port_default_set_log_level (jerry_log_level_t level);
 
+#ifndef CONFIG_DISABLE_ES2015_PROMISE_BUILTIN
+void jerry_port_jobqueue_init (void);
+jerry_value_t jerry_port_jobqueue_run (void);
+#endif /* !CONFIG_DISABLE_ES2015_PROMISE_BUILTIN */
+
 /**
  * @}
  */