There was no red carpet, but a taxi cab photo-op was parked out front, with cameras ready to take guests' pictures. This week, I headed to a packed movie theater in downtown New York City for the world premiere of " Keep the Meter Running ," one of several shows YouTube announced at its star-studded Upfronts presentation. YouTube, and its content creators, want their own prestige TV moment . "It's a streaming service. You go home, you sit on your couch, you open the YouTube app, and you watch