India is moving from an emerging-market opportunity to a global growth priority for consumer multinationals, as China slows and mature markets offer limited room for expansion. At the Barclays Global Consumer Staples Conference in Boston this week, top executives from nearly a dozen companies including Mondelez, L'Oreal, Nestle, Colgate-Palmolive, Reckitt, Yum Brands, Unilever, Philip Morris and Danone pointed to India's low consumption, rising incomes and expanding retail ecosystem form a huge opportunity to tap.