Merged revision(s) 1540807 from tomcat/trunk:
Only schedule a TimerTask when the first player enters the Room (and cancel it if the last player exits the Room).

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1540809 13f79535-47bb-0310-9956-ffa450edef68