Zygote : Block SIGCHLD during fork. am: b1f1209d9a am: 35b8453338 am: 14bd75fa79 am: 50b0c3be57  -s ours am: e1e735bcb9 am: 072b70bae3 am: ba6d5ee377 am: f3f784853d
am: 8ea47824fa

Change-Id: I6d31e839b51896830ae42ddad01581743fd4bd28