The standardized protocol already exists and it’s called DLNA which Chromecast initially cannibalized in its first release and then basically killed off every single other DLNA provider and app because they Sherlocked the feature into the Android operating system and to the Chrome browser.

Now that they are at risk of being split up for their monopoly, and as they lose an Antitrust case for their search monopoly, they are probably looking to kill off the Chrome brand because Chrome is how they entirely dominated the web, warping it to their standards and killing more open standards in favor of their Proprietary technology.