By now, everyone knows that YouTube has become a dominant streaming platform on TV sets. But on Wednesday, the Google-owned video giant took things a step further: It is TV. “Welcome to the YouTube era,” YouTube CEO Neal Mohan declared after stepping on stage at the company’s annual Brandcast upfront event, following a musical performance from Zara Larsson. “For decades, the entertainment industry was built on a series of bets, programming shows based on formulas and focus groups and guessing what would make an audience show up. At YouTube, we didn’t wait for a focus group. We built a stage and empowered anyone with a story to find an audience.” And some of those creators, as the company made clear, left TV to come to YouTube. That includes the evening’s host: Trevor Noah. “Some of you may recognize me from stand-up comedy. Some of you may recognize me from my podcast. Some of you might recognize me from The Daily Show . Some of you might recognize me from the Grammys,” Noah told the crowd.…