Google wants your data to do great things. That's not such a bad deal.

MOUNTAIN VIEW, Calif. — As I watched Google's many unveilings this week, I could sense a certain confidence in the proceedings. That was no doubt partly because the company was, for the first time in 10 years, hosting its Google I/O developer conference at its headquarters in Mountain View instead of San Francisco, so the executives and project managers were literally playing in their own backyard. But I think there was something else at play. Looking back at the opening keynote, CEO Sundar Pi...