[w3ctag/design-reviews] Delegated Ink Trail (#473)

Hello TAG!

I'm requesting a TAG review of Delegated Ink Trail

Achieving low latency is critical for delivering great inking experiences on the Web. Today, ink is generally produced by consuming PointerEvents and rendering strokes to the application view, but this introduces a good bit of latency by itself. The goal of this enhancement is to reduce this latency as much as possible, by providing a compact API that can add a few extra points to the end of the ink stroke that has already been rendered. This will be achieved by forwarding input directly to the display compositor. Then just before the back buffer is presented any points that haven’t already been rendered by the application can be applied and connected to the stroke already rendered. This, combined with potentially predicting a point or two ahead, can reduce perceived latency and provide a progressive enhancement over other latency improvements. 

  - Explainer: https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/WebInkEnhancement/explainer.md

  - Security and Privacy self-review: https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/WebInkEnhancement/SecuritySelfReview.md

  - Primary contacts (and their relationship to the specification): 
    - Mario Bianucci, @mabian-ms, Microsoft
    - Daniel Libby, @dlibby-, Microsoft
  - Organization/project driving the design: Microsoft
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://www.chromestatus.com/feature/5961434129235968


Further details:

  - [✔] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the work on this design is being done (or is intended to be done in the future): PointerEvents WG
  - Existing major pieces of multi-stakeholder review or discussion of this design: https://github.com/w3c/pointerevents/issues/204

  - Major unresolved issues with or opposition to this design: None
  - This work is being funded by: Microsoft

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 @mabian-ms

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