Google executive Sundar Pichai revealed today that the company’s Gmail app for Android has passed the 1 billion download mark._The app’s Google Play listing actually ticked over to the 1 billion+ range a couple days ago, but we’ll take Pichai’s official pronouncement as the final word. Gmail is the first app to cross the milestone if you don’t_count_the background Google Play services app. The race is on to see who’s next, but I wouldn’t be surprised if_Flappy Bird_made it_when it comes back to Android later_this summer.