Google I/O last year was Instant Apps, a new way to run Android applications without any installation. Buzzfeed video link would play the content in the Buzzfeed app, only downloading the parts required for video playback. Keep in mind that this is different from the streaming apps functionality.
Instant Apps were nearing public release, and now the time has come. The first wave of Instant Apps will be available “in a limited test,” including BuzzFeed, Periscope, Wish, and Viki. The functionality is available all the way back to Android Jellybean, thanks to being a component of Google Play Services.
Existing applications have to be modularized to allow running on-the-fly, for which a full SDK will be available “in the coming months.”