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