chromeos-common-script: Add project quota

Enable prjquota for stateful filesystem when the board is compiled
with USE flag prjquota.

TEST=On hatch, USE="prjquota" emerge-hatch chromeos-common-script:
Check project feature is enabled.
Re-emerge without the USE flag, check the project feature is removed.
Check emering with flag on eve (using kernel 4.4) throw an error.

Cq-Depend: chromium:2437093
Change-Id: I4ff8c57eb243121904ad83325d1e45aa14ca3766
Reviewed-by: Sarthak Kukreti <>
Reviewed-by: Chirantan Ekbote <>
Tested-by: Gwendal Grignou <>
Commit-Queue: Gwendal Grignou <>
1 file changed