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By Gerry Shih and Alexei Oreskovic LAS VEGAS/SAN FRANCISCO (Reuters) – Yahoo Inc Chief Executive Marissa Mayer unveiled a handful of new products, including a competitor to Google Incs predictive search technology for smartphones, in a debut appearance at the Consumer Electronics Show that drew a big crowd. The former Google executive who took the reins at Yahoo in the summer of 2012, has moved aggressively to revamp the struggling Internet companys business with product makeovers, acquisitions and a renewed focus on its media offerings. Yahoos services attracted more than 400 million monthly mobile users for the first time last fall, Mayer said, surpassing the 390 million mobile users it announced in October. Speaking in a keynote at the annual technology industry gathering in Las Vegas on Tuesday, Mayer announced Yahoos acquisition of Aviate, a company which makes a smartphone app that automatically brings up relevant information or other apps to suit a users activity.