As employees walk the multicolour-lighted concourse connecting three of the buildings forming part of Google’s headquarters for Europe, the Middle East and Africa across Dublin’s Barrow St, cranes can be seen on the site of the internet giant’s 13-storey extension under construction at the old Boland’s Mills, a short distance away along Grand Canal Dock. Down at street level, the technology behind electronic access control points does not seem to have earned the management’s trust – three security guards in high-vis check the comings and goings at each of the complex’s gates. Google’s 19 subsidiaries in the Silicon Docks (click…