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## Description This PR adds the `SnackBarTheme` subclass of InheritedTheme. Similarly to other theme classes. Despite missing, this class was mentioned in [flutter.dev/go/material-theme-system-updates](http://flutter.dev/go/material-theme-system-updates): "SnackBarTheme and SnackBarThemeData are conformant.. " ## Related Issue Fixes [Missing SnackBarTheme](https://github.com/flutter/flutter/issues/180000) ## Tests Adds 2 tests.