Color deprecations should have a dart fix

[Piinks]

trafficstars

Deprecations from https://github.com/flutter/engine/pull/54737 should have a dart fix.

I noticed user-created content out in the wild trying to help folks migrate:

Dart fix has not been enabled for dart:ui and others, following up in https://github.com/dart-lang/sdk/issues/59764

WIP PR to add this support in https://github.com/flutter/flutter/pull/160616

For reference, the migration guide: https://docs.flutter.dev/release/breaking-changes/wide-gamut-framework