That’s right, it’s finally happening. Not exactly the way we’d hoped, but it’s coming along.
You can’t yet cast your tab in Chrome for Android, but you CAN at least cast videos embedded in your Chrome for Android (beta version).
Simply enable the flag chrome://flags/#enable-cast restart your browser and voila. You can test it out by going to youtube.com (the website, not the app) and you should see the cast button, the same as you would in the app.