gistfile1.js

// In your toolstrip JS onClick event
var port chrome.self.connect();
port.postMessage({array:of, some:elements});

// In your content-script
// Event handler that listens for responses from
// the extension
chrome.extension.onConnect().addListener(function(port) {
    port.onMessage.addListener( function( data ) {
        // Data is the response, resize your window here
    });
});