The value for the TCP initial receive window comes from,
in order,
kernel
/proc/sys/net/ipv4/tcp_default_init_rwnd
init.rc (via properties)
net.tcp.default_init_rwnd
properties
net.tcp.default_init_rwnd
gservices
Settings.Global.TCP_DEFAULT_INIT_RWND
Bug: 12020135
Change-Id: I0e271be19472900fa9f3bab037d53383ec014a9e