src/vs/workbench/api/common/extHostTheming.ts/ExtHostTheming/constructor
class ExtHostTheming:	constructor(
		@IExtHostRpcService _extHostRpc: IExtHostRpcService
	) {
		this._actual = new ColorTheme(ColorThemeKind.Dark);
		this._onDidChangeActiveColorTheme = new Emitter<ColorTheme>();
	}