Rather, Wayland was still a hobby project during ChromeOS' development and X11 always has been ridiculous security-wise. Also the decision allowed them to tight

Rather, Wayland was still a hobby project during ChromeOS' development and X11 always has been ridiculous security-wise. Also the decision allowed them to tightly tie Chrome into the graphics stack (compressed textures, color-space handling, hw plane accelerated compositing etc.), this has become viable on Wayland only recently.