Added GCM to proto description
Added GCM to proto description

Yu-Qiu/test-pushd,futurice/pushd,avqdev/pushd,futurice/pushd,peleccom/pushd,avqdev/pushd,rs/pushd,rs/pushd,chobiwa/pushd,peleccom/pushd,chobiwa/pushd,Suninus/pushd,Binarypark/pushd,mattwoberts/pushd,Yu-Qiu/test-pushd,Binarypark/pushd,4screens/pushd,Suninus/pushd,Product-Foundry/pushd,Product-Foundry/pushd,mattwoberts/pushd,4screens/pushd