[w3ctag/design-reviews] CSS Animation Worklet API (#349)

Góðan dag TAG！

I'm requesting a TAG review of:

  - Name: CSS Animation Worklet API
  - Specification URL: https://drafts.css-houdini.org/css-animationworklet/

  - [Explainer](https://github.com/w3c/css-houdini-drafts/blob/master/css-animationworklet/README.md), [Design Principles and Goals](https://github.com/w3c/css-houdini-drafts/blob/master/css-animationworklet/principles.md), Example codes [1](https://googlechromelabs.github.io/houdini-samples/), [2](https://aw-playground.glitch.me/) 
       
  - Tests: https://github.com/web-platform-tests/wpt/tree/master/animation-worklet

  - Primary contacts:  majido

Further details (optional):

  - Relevant time constraints or deadlines: We like to ship a first version in Chrome M75 which branches Apr 18th, 2019.
  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). The [assessment is here](https://github.com/w3c/css-houdini-drafts/issues/868).
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

You should also know that...

This specification has been developed in CSS HoudiniTF for some time now (started incubation in WICG from Oct 2016 and moved to Houdini TF repo in Apr 2018). Somehow we never filed a TAG review for it 🤦‍♂️ but better late than never. We appreciate any feedback you may have on this specification.

Animation Worklet is designed to provide an extensibility point for Web Animations and enables
rich high-performance scripted animations which can run off main-thread. The latter ability combined with other new features (e.g., [1](https://wicg.github.io/scroll-animations/), [2](https://github.com/w3c/css-houdini-drafts/issues/834#issuecomment-470579488)) has the potential to allow many of currently main-thread rAF-based animations to move off thread and improve their smoothness. 

We'd prefer the TAG provide feedback as (please select one):

  - [ ] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [x] leave review feedback as a comment in this issue and @-notify [github usernames]

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For background, see our [explanation of how to write a good explainer](https://w3ctag.github.io/explainers).


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