Use input_playback.py to emulate keypress for window maximization (F4) and verify window is maximized.

See platform_InputBrightness.py and graphics_VTSwitch on how to take screenshots to verify results.

We have to define "verify window is maximized". 
Could be use javascript expression to confirm the browser window size is as expected(max ).
Other ideas?

Yes, javascript commands would work better. 

Maybe something like this?

function resize()
{
 return true;
}

window.onresize = resize;

When the window is resized, this will return true. Any other thoughts Kalin?

(See logging_FeedbackReport on how to implement js commands.)