In a discussion thread in https://codereview.chromium.org/2656893003/, we realize that
the current allocation of frame_sink_id on different platforms, or even one single platform
with different implementations, are all over the places.
It would be beneficial for future maintenance if we can centralize all these framesinkid
allocation in one single place. This refactoring effort needs careful planning that involves all platforms.
Comment 1 by xlai@chromium.org
, Jan 26 2017