[Feature Request]: support running desktopCapturer in chrome --headless mode

[chenzx]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem Description

I want to use electron simply as a WebRTC stream publishing client to replace crippled ffmpeg/gstreamer.
The ffmpeg/gstreamer's RTP stream publishing cmdline cannot properly deal with WebRTC's RTCP/PLI keyframe request.

That is to say, i need the following code working:

const {app, BrowserWindow} = require('electron')
app.commandLine.appendSwitch('ignore-gpu-blacklist')
app.commandLine.appendSwitch('headless') //<--

  const mainWindow = new BrowserWindow({
    width: 1,
    height: 1,
    //no need to set show:false, since chrome's --headless mode is CLI mode without window...
    webPreferences: {
      nodeIntegration: true,
      contextIsolation: false,
      preload: path.join(__dirname, 'preload.js')
    }
  });

Proposed Solution

desktopCapturer api currently needs running in renderer side, but it should be able to run without window system.

Alternatives Considered

If can support, electron will become the best/convenient full-functinal WebRTC client, used in App Window to Video Live Streaming scenario.

Additional Information

No response

[zcbenz]

The problem is Electron does not really support headless mode (see #27052), I'm merging this to #228.