src/vs/workbench/contrib/debug/browser/debugSession.ts/DebugSession/customRequest
class DebugSession:	customRequest(request: string, args: any): Promise<DebugProtocol.Response | undefined> {
		if (!this.raw) {
			throw new Error(localize('noDebugAdapter', "No debugger available, can not send '{0}'", request));
		}

		return this.raw.custom(request, args);
	}