The PR that introduced this behavior to the getDisplayMedia spec was approved by Apple engineer Youenn Fablet.

Links:
* Explainer: https://docs.google.com/document/d/1M63lyDHV-v6LPFzHjfsjBDMfyn075pySa3xfIRSB9zU/edit?usp=sharing
* Spec: https://github.com/w3c/mediacapture-screen-share/pull/216/files
* ChromeStatus entry: https://chromestatus.com/feature/5118675366445056