Zygote : Block SIGCHLD during fork. am: b6f3751599 am: b23e864573 am: 52021073a4 am: 479385b6b3 am: 5f70cb0898 am: df3e599c7d am: 19ee3109e1 am: bf3c83eeac
am: 11959bd5fc

Change-Id: I8caf4888a5b7294ef0b7d958057ea4e7ddf971a5