Google used shell companies and subsidiaries to hide its involvement in expansion plans that yielded millions of dollars in tax breaks, according to a report by The Washington Post on Friday, casting light on how tech companies cut deals with local governments. When the search giant planned to build a data center in Midlothian, Texas, Google used a subsidiary called Sharka LLC, The Post reported. Other subsidiaries Google set up for development projects include Jet Stream LLC and Questa LLC.