[w3ctag/design-reviews] Dark mode support for web apps (Issue #696)

Braw mornin' TAG!

I'm requesting a TAG review of dark mode support for web apps.

This feature adds a `user_preferences` manifest member which allows apps to specify a different theme color and background color for dark mode and other user preferences in the future.
```json
"user_preferences": {
    "color_scheme_dark": {
        "theme_color": "#000"
        "background_color": "#000"
    }
  }
```

  - Explainer: https://github.com/WICG/manifest-incubations/blob/gh-pages/user-preferences-explainer.md

  - Tests: None in WPT yet
  - Security and Privacy self-review: Minimal security/privacy effects. This will allow sites to know which user preferences are set but this information is already exposed through CSS.
  - GitHub repo: https://github.com/WICG/manifest-incubations

  - Primary contacts (and their relationship to the specification):
      - Louise Brett (loubrett), Google
      - Glen Robertson (phoglenix), Google
      - Matt Giuca (mgiuca), Google
  - Organization(s)/project(s) driving the specification: Google
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
      - https://chromestatus.com/feature/5714780426862592

      - https://crbug.com/1271804 

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: Targeting origin trial in M99
  - The group where the work on this specification is currently being done:https://github.com/WICG/manifest-incubations

  - The group where standardization of this work is intended to be done: https://github.com/WICG/manifest-incubations

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

We'd prefer the TAG provide feedback as:

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


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