Wait for opening apps ready before stopping freezing display

When the screen rotation is changing, we will freeze the display
until all the window surfaces are all drawn (this is not including
windows which have no surface). If the opening app's window surface
is created after we stop freezing the display, there would be no
waiting for the app, and the user would see the black screen.

In this change, we would not only wait for the windows which have
surface, but also wait for the windows about to have surface before
stopping freezing display.

https://code.google.com/p/android/issues/detail?id=150921

Change-Id: I7de4db8ca902236f3e9f730b04dbde681cf8c032