I am new to chrome extensions and trying to work this out.

When I click on the extension button, it should copy the current url and open google.com in a new tab then place this url in searchbox or console print the url. Basically, Copy the url to new tab, which can be used to perform further actions.

We can open new tab using.

chrome.browserAction.onClicked.addListener(function(tab) {
    var action_url = "http://www.google.com"
    chrome.tabs.create({ url: action_url });
  });

Not sure how to call functions/perform actions after the new tab openx