Getting the upper bound of upstream capacity from TCP
Getting the upper bound of upstream capacity from TCP

Summary:
Add UpstreamCapacity trace field

Test Plan: unit test. will to a manual test with UserLog

Reviewed By: benyluo@fb.com

Subscribers: yfeldblum, bmatheny, marauder-realtime@, seanc

FB internal diff: D2225309

Tasks: 7150682

chenmoshushi/proxygen,zhiweicai/proxygen,chenmoshushi/proxygen,hiproz/proxygen,LilMeyer/proxygen,raphaelamorim/proxygen,zhiweicai/proxygen,hnutank163/proxygen,raphaelamorim/proxygen,pueril/proxygen,KublaikhanGeek/proxygen,wrmsr/proxygen,songfj/proxygen,wrmsr/proxygen,hongliangzhao/proxygen,Werror/proxygen,Orvid/proxygen,fqihangf/proxygen,KublaikhanGeek/proxygen,wrmsr/proxygen,jgli/proxygen,KublaikhanGeek/proxygen,hnutank163/proxygen,hnutank163/proxygen,zhiweicai/proxygen,zhiweicai/proxygen,LilMeyer/proxygen,songfj/proxygen,Werror/proxygen,supriyantomaftuh/proxygen,fqihangf/proxygen,hongliangzhao/proxygen,LilMeyer/proxygen,pueril/proxygen,hongliangzhao/proxygen,chenmoshushi/proxygen,supriyantomaftuh/proxygen,Werror/proxygen,KublaikhanGeek/proxygen,Werror/proxygen,jgli/proxygen,songfj/proxygen,hiproz/proxygen,supriyantomaftuh/proxygen,jgli/proxygen,pueril/proxygen,raphaelamorim/proxygen,songfj/proxygen,fqihangf/proxygen,raphaelamorim/proxygen,chenmoshushi/proxygen,hongliangzhao/proxygen,pueril/proxygen,hiproz/proxygen,Orvid/proxygen,Orvid/proxygen,hnutank163/proxygen,hiproz/proxygen,wrmsr/proxygen,jgli/proxygen,LilMeyer/proxygen,fqihangf/proxygen,Orvid/proxygen,supriyantomaftuh/proxygen