A Google Inc. employee displays the new Nexus 7 tablet during the Google I/O conference in San Francisco on June 27, 2012. Google Inc. unveiled a $199 handheld computer called the Nexus 7 that features a 7-inch screen and is designed to help the company vie with Apple Inc., Microsoft Corp. and Amazon.com Inc. in the surging market for tablets. Photographer: David Paul Morris/Bloomberg