If you actually work at Google I would encourage you to do a search of the codebase for files named .*\.dart and you'll spot a broad cross-section of Google, fr

If you actually work at Google I would encourage you to do a search of the codebase for files named .*\.dart and you'll spot a broad cross-section of Google, from Google Fiber (set top box and the customer portal), to AdSense and AdWords, to Election Maps, to folks in Geo are using Dart for their front-ends.