Google for Android will soon get a feature that will allow you to continue to watch/listen to media, even as you switch tabs.
Go back to Settings > System and scroll down until you find the "Developer options" entry. Tap that entry. Scroll down until you find the "Quick settings developer tiles" entry and tap it. On the ...
Google is developing new, automatic Picture-in-Picture (PiP) feature for the Chrome app on Android. More details here.