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This restriction will control access to the confidential content by
websites/extensions using 3P Web/Extensions Screen Casting API, e.g.:
1) https://www.w3.org/TR/screen-capture/
2) https://developer.chrome.com/extensions/desktopCapture
3) https://developer.chrome.com/extensions/tabCapture
These API are mostly used for screen share, e.g.Google Meet, or
3P screen capture extensions, e.g.Screencastify.

Bug: 1134566
Change-Id: I25dbf7b8a548c5884f81cf0d1d37308b000a8863
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514206
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Aya Elsayed <ayaelattar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823969}