src/vs/workbench/contrib/webview/browser/themeing.ts/fromTheme
	export function fromTheme(theme: IWorkbenchColorTheme): ApiThemeClassName {
		switch (theme.type) {
			case ColorScheme.LIGHT: return ApiThemeClassName.light;
			case ColorScheme.DARK: return ApiThemeClassName.dark;
			case ColorScheme.HIGH_CONTRAST_DARK: return ApiThemeClassName.highContrast;
			case ColorScheme.HIGH_CONTRAST_LIGHT: return ApiThemeClassName.highContrastLight;
		}
	}