Vaapi is not the only mechanism that can be used for hardware decode. V4l2 is an alternative, the one that will be used on the raspberry pi with the open source vc4 driver (see blog posts https://anholt.github.io/twivc4/2018/02/12/twiv/ ). I believe there is some communication between chromium and the pi makers about implementing this, but I am doubtful this will make it upstream.
Vaapi is not the only mechanism that can be used for hardware decode. V4l2 is an alternative, the one that will be used on the raspberry pi with the open source vc4 driver (see blog posts https:/ /anholt. github. io/twivc4/ 2018/02/ 12/twiv/ ). I believe there is some communication between chromium and the pi makers about implementing this, but I am doubtful this will make it upstream.