[w3ctag/design-reviews] Cross-origin opener policy reporting API (#527)

Saluton TAG!

I'm requesting a TAG review of Cross-origin opener policy API.

We want to provide a reporting API for cross-origin opener policy (COOP) to help developers deploy it on their websites. In addition to reporting breakages when COOP is enforced, we want to provide a report-only mode for COOP. The report-only mode for COOP will not enforce COOP, but it will report potential breakages that would have happened had we enforced COOP.

  - Explainer: [https://github.com/camillelamy/explainers/blob/master/coop_reporting.md](https://github.com/camillelamy/explainers/blob/master/coop_reporting.md)
  - Security and Privacy self-review: Inside the explainer.
  - Primary contacts:
      - [Camille Lamy](https://github.com/camillelamy): Google, Chromium implementer
  - Organization/project driving the design: Chromium 
  - External status/issue trackers for this feature: [Chrome Status](https://www.chromestatus.com/feature/5755687994916864), [Chrome issue](https://bugs.chromium.org/p/chromium/issues/detail?id=1059303)

Further details:

  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done: [WHATWG](https://github.com/whatwg)
  - The group where standardization of this work is intended to be done: [WHATWG](https://github.com/whatwg)
  - Existing major pieces of multi-stakeholder review or discussion of this design: [GitHub issue](https://github.com/whatwg/html/issues/5260)
  - Major unresolved issues with or opposition to this design:
  - This work is being funded by: Google

You should also know that...

[please tell us anything you think is relevant to this review]

We'd prefer the TAG provide feedback as (please delete all but the desired option):
  🐛 open issues in our GitHub repo for **each point of feedback**

Thank you!
Camille

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