src/vs/workbench/api/common/extHostTheming.ts/ExtHostTheming/$onColorThemeChange
class ExtHostTheming:	$onColorThemeChange(type: string): void {
		let kind = type === 'light' ? ColorThemeKind.Light : type === 'dark' ? ColorThemeKind.Dark : ColorThemeKind.HighContrast;
		this._actual = new ColorTheme(kind);
		this._onDidChangeActiveColorTheme.fire(this._actual);
	}