[TIMOB-16847] Mobile web(Win 8): Black area renders when a text field gains focus

Sample App: https://dl.dropboxusercontent.com/u/54185251/TextFieldTest.zip 1.- Run the sample application on a windows device (internet explorer) 2.- Focus the 1st text field, then focus the 2nd one, then 3rd one, and then the 4th one. 3.- Observe how the black area's height seems to increase as you focus the four text fields on the screen; at this point, when the 4th text field has the focus on it, the screen is practically all black. Expected Result: The window scrolls up on each focus and reveals the following objects on the view. Actual Result: The window scrolls up but fails to render data previously blocked by the keyboard, creating a large black box.