chromium 是做什么的？
Records screen video on ChromeOS devices, Chromebooks, and CrOS DUTs over SSH using ffmpeg KMS grab, and transcodes the video to MP4 on the host workstation. Use when recording the screen of a Chromebook, ChromeOS device, cros DUT, or CrOS test hardware, capturing visual bug reproductions or feature demonstrations on ChromeOS/cros, starting/stopping background screen capture on a Chromebook or ChromeOS DUT, checking recording status on a cros device, or pulling and transcoding recorded video fil