[mediacapture-handle] Tab capture restriction (#43)

aboba has just created a new issue for https://github.com/w3c/mediacapture-handle:

== Tab capture restriction ==
The Abstract says "It describes a mechanism for [tab capture](https://www.w3.org/TR/screen-capture/#dfn-browser) only."

However, Section 5.2 says: 

"If the track in question is not a video track, or is not the result of a capture of a display surface, then the user agent MUST return null."

This seems to allow a CaptureHandle to be returned in scenarios other than tab capture.



Please view or discuss this issue at https://github.com/w3c/mediacapture-handle/issues/43 using your GitHub account


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