[w3ctag/design-reviews] API for capturing all screens (Issue #856)

こんにちは TAG-さん!

I'm requesting a TAG review of "capture all screens" (getAllScreensMedia).

In some scenarios (e.g. legal compliance or training purposes) it must be ensured that all screens attached to a client are captured. With `getDisplayMedia`, a web application would need to call the API N-times, asking the user to pick a different screen each time. This is a cumbersome and error-prone process and it can't be guaranteed that all the screens are captured. We propose the `getAllScreensMedia` API that allows capturing of all screens without user interaction. To protect the users privacy, the API is safe-guarded by an enterprise policy and the user must be notified *before* capture can happen and *while* capturing is happening.

  - Explainer: [Url](https://github.com/screen-share/capture-all-screens/blob/main/README.md)
  - Specification URL: [Spec Url](https://screen-share.github.io/capture-all-screens/), [Code](https://github.com/screen-share/capture-all-screens/blob/main/index.html)
  - Tests: No WPT as a policy needs to be set. [Other tests](https://source.chromium.org/search?q=getallscreensmedia%20f:test.cc%20-f:out%2F)
  - User research: [Developer feedback](https://github.com/screen-share/capture-all-screens/issues/9)
  - Security and Privacy self-review: TBD (will be posted in a comment below)
  - GitHub repo: [Url](https://github.com/screen-share/capture-all-screens)
  - Primary contacts (and their relationship to the specification):
      - Simon Hangl (@shangl, Google)
      - Elad Alon (@eladalon1983, Google)
  - Organization(s)/project(s) driving the specification: Google
  - Key pieces of existing multi-stakeholder review or discussion of this specification: [Developer feedback](https://github.com/screen-share/capture-all-screens/issues/9), [SCCG presentation](https://docs.google.com/presentation/d/12rkZiPoOSz8jRsVpT2O5JKPowcByo1O5dL4sJQjYgKQ/edit?usp=sharing), [SCCG meeting minutes](https://github.com/screen-share/meetings/blob/main/minutes/2023-02-16.md) ([SCCG](https://www.w3.org/community/sccg/))
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): [Chrome status](https://chromestatus.com/feature/6284029979525120)

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: N/A
  - The group where the work on this specification is currently being done: [SCCG](https://www.w3.org/community/sccg/)
  - The group where standardization of this work is intended to be done: N/A
  - Major unresolved issues with or opposition to this specification: N/A
  - This work is being funded by: Google

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  💬 leave review feedback as a **comment in this issue** and @-notify @shangl






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