Fix: porting done

src/game/lib/stage_timer.js

@@ -67,6 +67,11 @@ StageTimer.prototype.removeTimer = function() {
 	this.timerEvent = null;
 }
 
+StageTimer.prototype.add = function(timeSec) {
+	this.timeLeft += timeSec;
+	this.printTime();
+}
+
 
 StageTimer.FONT_HEIGHT_PX		= 70;