@waffo Though of something else to mention:
I'm in the US, so if you are also in the US you will have to follow these steps. (Mohammedpatla is in Canada).
The option to cast a tab didn't show up in the option menu as described in the developer update, but it did on youtube videos. While casting a youtube video the Chromecast icon showed up in the top right. I right clicked that icon and selected "always show icon" so now I can cast ANY tab, not just youtube videos.