[mediacapture-screen-share] Pull Request: Add spec-hooks for "actively screen-capturing"

eladalon1983 has just submitted a new pull request for https://github.com/w3c/mediacapture-screen-share:

== Add spec-hooks for "actively screen-capturing" ==
Fixes #213.

See https://github.com/w3c/mediacapture-screen-share/pull/224


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