i just use windows keyboard shortcuts during my application login automation, (maybe you could put it under @Before tag) to maximize current window.  not exactly what you're asking but it works.

  public static void maximizeWindowUsingKeyboardShortcut() throws Exception
  {
    // use windows keyboard shortcut to maximize active window.
    Keyboard.keyDown(Keys.LEFT_SYSTEM);
    Keyboard.pressKey(Keys.UP);
    Keyboard.keyUp(Keys.LEFT_SYSTEM);
  }

Thanks for your reply Joseph Vanderzwart

unfortunately. This did not work for me.. Just to explain further the issue:

1)No existing browser is opened: I am running script from eclipse.  script opens new chrome browser but it left minimized in taskbar and blinks . eclipse is still maximized and I have to click the browser to maximize it.. Not as expected

2)If i have existing chrome browser opened and it is minimized: I am running script from eclipse. script opens new chrome browse in maximize mode.. This is fine

2)If i have existing chrome browser opened and it is maximized  but hidden behind eclipse: I am running script from eclipse. script opens new chrome browse in minimized mode  like scenario 1 and I have to  click the browser to maximize it.. Not as expected

Hi Joseph Vanderzwart

below line of code helped in scenario2 and 3 but I still need help in scenario1 when there is no existing browser opened and i believe this is most frequent scenario. Please help

Keyboard.keyDown(Keys.LEFT_SYSTEM);
Keyboard.pressKey(Keys.D);
Keyboard.keyUp(Keys.LEFT_SYSTEM);

Thanks

Devkant

Hi Devkant, 

Can you try below code. It should be used after you launch Chrome browser. 

//Execute the Standard Windows commands

Window stdBrowser = env.describe(Window.class, new WindowDescription.Builder().windowTitleRegExp(" Google Chrome").index(1).build());

 stdBrowser.activate();

 stdBrowser.maximize();

Hope that it could help !

Thanks, 
Lien