Use case

The Apple HIG contains the system colors mint, cyan, and brown. These colors are missing from CupertinoColors. All the other system colors are included in CupertinoColors.

Proposal

The three missing Apple system colors should be included in CupertinoColors in the same way that the other system colors are.

I will create an MR addressing this issue.

Once these colors have been added, the diagram in the documentation should also be updated. The source for the diagram is here: https://github.com/flutter/assets-for-api-docs/blob/master/packages/diagrams/lib/src/cupertino_colors.dart.