Function read_devtools_active_port 

pub fn read_devtools_active_port() -> Result<(u16, String), ChromeError>

Read the DevToolsActivePort file from the default user data directory.

Returns (port, ws_path) on success.

Errors

Returns ChromeError::NoActivePort if the file is missing or unreadable, or ChromeError::ParseError if the contents are malformed.