Function print_browser_gpu 

fn print_browser_gpu(modules: &[String]) -> Result<(), String>

Print the device the browser draws with, as the page describes it.

The browser is a backend the host pass cannot report on — a WebGL2 adapter only exists inside the page — so this is the browser’s half of what cargo xtask print-gpu prints for the host. Any test module answers, since the description comes from the harness rather than from the test.