Need help in converting a javaScript Button into lightning component button.

There is a JavaScript button, which I need to convert into lightning component button.

{!REQUIRESCRIPT("/xdomain/xdomain.js")} 

{!REQUIRESCRIPT("/support/console/37.0/integration.js")} 

{!REQUIRESCRIPT("/apex/VFPage1")} 

VFPage1.showLoadingIndicator();

VFPage1.initRequest("../apex/VFPage2?accId={!Account.Id}&guid={!Account.customfield__c}",'StringValue', function(message) { alert(message); },"../{!Account.Id}");

VFPage1 page   contentType="text/javascript" has custom javaScript functions in it

( showLoadingIndicator(), initRequest() etc...)

 VFPage2  is communicating with Apex Class Controller methods. None of the controller methods are Static.

One of the method is calling the inhouse webservice  using

Continuation con = new Continuation(InhouseService.WebserviceCalloutTimeout);