I've been clattering around the google developers console for a while, and i just can't get it to work with Craft! I figured it'd be simple (and it may well be!) considering in Craft it just asks for two bits of data, "Access Key ID" and "Secret Access Key".
After an age of digging about in the google developes console site and a bit of searching, i ended up in the Project Dashboard for my Cloud Storage. Enabling "Interoperable Access" gave me some new tabs on the side, one of which is "Interoperable Access", and in there FINALLY i found two strings that have the names "Access Key" and "Secret".
Putting them into Craft and hitting refresh next to Bucket gives me the error "Credentials rejected by target host".
And so now i'm stumped! Does anyone have experience using Google Cloud Storage with Craft who can point me in the right direction?