src/vs/server/node/extensionHostConnection.ts/ExtensionHostConnection/_sendSocketToExtensionHost
class ExtensionHostConnection:	private async _sendSocketToExtensionHost(extensionHostProcess: cp.ChildProcess, connectionData: ConnectionData): Promise<void> {
		// Make sure all outstanding writes have been drained before sending the socket
		await connectionData.socketDrain;
		const msg = connectionData.toIExtHostSocketMessage();
		extensionHostProcess.send(msg, connectionData.socket);
	}