java phantomjs change screen resolution

Question

I need to override screen object. I used exapmples from here How do I override window.screen? and here http://phantomjs.org/api/webpage/handler/on-initialized.html
But my code does not work.

PhantomJSDriver phantom = new PhantomJSDriver(caps);
phantom.executePhantomJS("onInitialized = function() {\n" +
                "    evaluate(function() {\n" +
                "        window.screen.availWidth = 1024;\n" +
                "        window.screen.availHeight = 768;\n" +
                "    });\n" +
                "};");
System.out.println(phantom.executeScript("return window.screen;"));
phantom.get("http://www.browserleaks.com/javascript");
System.out.println(phantom.executeScript("return window.screen;"));

Here is my console output:

{availWidth=1440, pixelDepth=32, availTop=0, width=1440, colorDepth=32, availLeft=0, availHeight=860, height=900}
{availWidth=1440, pixelDepth=32, availTop=0, width=1440, colorDepth=32, availLeft=0, availHeight=860, height=900}

Note that this line:

webDriver.manage().window().setSize(new Dimension(980, 1461));

changes only availWidth and availHeight properties in screen object.

Can anyone suggest me how to override all properties in screen object?