Why can’t I see a viz process in Chrome’s process group?

[zhengxianwei]

According to several online documents — for example this one — Chrome is supposed to launch a viz-process, which receives viz::CompositorFrame objects, performs compositing, and then sends the results to the gpu-process for rendering.

However, on my local Chrome build, no matter what command-line flags I use, there’s never a separate viz-process running. Why is that? Has its functionality been merged into another process, such as the browser process?