MOUNTAIN VIEW, Calif. — Eric Schmidt has a message: Don't let the lava lamps fool you. Google Inc. is serious. As Google's chief executive, Schmidt presides over a headquarters filled with trinkets, pets, free food and bouncy-ball chairs. But the whimsical workplace belies the company's focus on cold, hard numbers. Schmidt, 51, oversees operations — a crucial role as the company hires voraciously...