[w3ctag/design-reviews] WebXR Layers (#528)

Saluton TAG!

I'm requesting a TAG review of the [WebXR Layers specification](https://immersive-web.github.io/layers/).

WebXR Layers offers a more efficient way of drawing immersive content than WebXR. In addition to support for native textures and texture arrays, it also provides support for different layer types that are managed by the system compositor (as opposed to javascript). This spec is an optional module that extends the feature set of [WebXR](https://immersive-web.github.io/webxr).

  - Specification URL: https://immersive-web.github.io/layers/

  - Explainer: https://github.com/immersive-web/layers/blob/master/explainer.md

  - Security and Privacy self-review: Inside the spec.
  - GitHub repo (if you prefer feedback filed there): https://github.com/immersive-web/layers/

  - Primary contacts:
      - [Rik Cabanier]([cabanier]), [Facebook](https://www.facebook.com/)
  - Organization/project driving the design: [Oculus](https://www.oculus.com/) ([Facebook](https://www.facebook.com/))
  - External status/issue trackers for this feature: 
    - [Chrome Status](https://chromestatus.com/admin/features/edit/6287363875536896)
    - [Chrome Tracking bug](https://bugs.chromium.org/p/chromium/issues/detail?id=1096923)

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 (or is intended to be done in the future): [W3C Immersive Web CG](https://www.w3.org/community/immersive-web/)
  - The group where standardization of this work is intended to be done: [W3C Immersive Web WG](https://github.com/immersive-web)
  - Major unresolved issues with or opposition to this design: none
  - This work is being funded by: [Facebook](https://www.facebook.com/)

We'd prefer the TAG provide feedback as:
  🐛 open issues in our GitHub repo for **each point of feedback**


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