API Change to support existence watermark deadline for GlobalData
API Change to support existence watermark deadline for GlobalData

----Release Notes----
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=90205325

RyanSkraba/beam,dhalperi/incubator-beam,tyagihas/DataflowJavaSDK,charlesccychen/beam,markflyhigh/incubator-beam,smarthi/DataflowJavaSDK,dhalperi/incubator-beam,chamikaramj/beam,ravwojdyla/incubator-beam,chamikaramj/incubator-beam,RyanSkraba/beam,springml/DataflowJavaSDK,staslev/incubator-beam,tweise/incubator-beam,ahartley39/DataflowJavaSDK,tgroh/incubator-beam,PieterDM/DataflowJavaSDK,apache/beam,lukecwik/incubator-beam,dhalperi/beam,xsm110/Apache-Beam,robertwb/incubator-beam,sureshjosh/DataflowJavaSDK,jbonofre/incubator-beam,haonature888/DataflowJavaSDK,chamikaramj/beam,sammcveety/DataflowJavaSDK,peihe/DataflowJavaSDK,eljefe6a/incubator-beam,tweise/incubator-beam,lukecwik/incubator-beam,rangadi/beam,jbonofre/beam,haonature/DataflowJavaSDK,springml/DataflowJavaSDK,xsm110/Apache-Beam,apache/beam,charlesccychen/incubator-beam,wtanaka/beam,amitsela/beam,manuzhang/beam,staslev/incubator-beam,vikaspalkar/DataflowJavaSDK,iemejia/incubator-beam,lukecwik/incubator-beam,staslev/beam,robertwb/incubator-beam,apache/beam,apache/beam,amitsela/incubator-beam,lukecwik/incubator-beam,peihe/DataflowJavaSDK,markflyhigh/incubator-beam,jbonofre/beam,dhalperi/beam,apache/beam,charlesccychen/incubator-beam,Test-Betta-Inc/musical-umbrella,tyagihas/DataflowJavaSDK,wtanaka/beam,charlesccychen/beam,tgroh/beam,tweise/beam,dhananjaypatkar/DataflowJavaSDK,nagachika/DataflowJavaSDK,jbonofre/beam,robertwb/incubator-beam,RyanSkraba/beam,tgroh/beam,charlesccychen/beam,rangadi/incubator-beam,chamikaramj/beam,jasonkuster/incubator-beam,peihe/incubator-beam,jasonkuster/beam,eljefe6a/incubator-beam,wangyum/beam,PieterDM/DataflowJavaSDK,chamikaramj/beam,markflyhigh/incubator-beam,mxm/incubator-beam,yk5/beam,twcctz500000/DataflowJavaSDK,vikaspalkar/DataflowJavaSDK,charlesccychen/beam,robertwb/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,charlesccychen/beam,RyanSkraba/beam,jasonkuster/incubator-beam,vemmaverve/DataflowJavaSDK,yk5/beam,joshualitt/DataflowJavaSDK,Priyalc/Gcloud,markflyhigh/incubator-beam,haocafes/DataflowJavaSDK,lukecwik/incubator-beam,tgroh/beam,nevillelyh/DataflowJavaSDK,apache/beam,charlesccychen/beam,robertwb/incubator-beam,haocafes/DataflowJavaSDK,chamikaramj/beam,prabeesh/DataflowJavaSDK,robertwb/incubator-beam,wangyum/beam,dhananjaypatkar/DataflowJavaSDK,markflyhigh/incubator-beam,smarthi/DataflowJavaSDK,chamikaramj/incubator-beam,wtanaka/beam,chamikaramj/beam,vikkyrk/incubator-beam,wangyum/beam,robertwb/incubator-beam,apache/beam,tgroh/incubator-beam,xsm110/Apache-Beam,ahartley39/DataflowJavaSDK,amarouni/incubator-beam,elibixby/DataflowJavaSDK,vikkyrk/incubator-beam,sammcveety/incubator-beam,manuzhang/beam,lukecwik/incubator-beam,rangadi/beam,iemejia/incubator-beam,charlesccychen/beam,twcctz500000/DataflowJavaSDK,apache/beam,apache/beam,dhalperi/beam,RyanSkraba/beam,lukecwik/incubator-beam,joshualitt/DataflowJavaSDK,lukecwik/incubator-beam,robertwb/incubator-beam,haonaturel/DataflowJavaSDK,chamikaramj/beam,markflyhigh/incubator-beam,RyanSkraba/beam,tomwhite/DataflowJavaSDK,manuzhang/incubator-beam,josauder/AOP_incubator_beam,peihe/incubator-beam,rangadi/beam,chamikaramj/beam,haonaturel/DataflowJavaSDK,rangadi/beam,jasonkuster/beam,mxm/incubator-beam,joshualitt/incubator-beam,manuzhang/beam,sammcveety/incubator-beam,lukecwik/incubator-beam,vemmaverve/DataflowJavaSDK,elibixby/DataflowJavaSDK,ravwojdyla/incubator-beam,prabeesh/DataflowJavaSDK,sammcveety/DataflowJavaSDK,jbonofre/incubator-beam,josauder/AOP_incubator_beam,amarouni/incubator-beam,rangadi/beam,charlesccychen/incubator-beam,jasonkuster/beam,amitsela/incubator-beam,nagachika/DataflowJavaSDK,eljefe6a/incubator-beam,rangadi/beam,staslev/beam,amitsela/beam,peihe/incubator-beam,rangadi/incubator-beam,manuzhang/incubator-beam,rangadi/incubator-beam,sammcveety/incubator-beam,yk5/beam,chamikaramj/beam,apache/beam,apache/beam,Priyalc/Gcloud,joshualitt/incubator-beam,sureshjosh/DataflowJavaSDK,chamikaramj/beam,staslev/beam,tgroh/beam,markflyhigh/incubator-beam,Test-Betta-Inc/musical-umbrella,ravwojdyla/incubator-beam,amitsela/beam,jbonofre/beam,wangyum/beam,rangadi/beam,haonature888/DataflowJavaSDK,tomwhite/DataflowJavaSDK,tweise/beam,RyanSkraba/beam,vikkyrk/incubator-beam,haonature/DataflowJavaSDK,robertwb/incubator-beam