Fixed constant window switching on lock screen with Swype KB.

We allow TYPE_INPUT_METHOD windows to show on the lock screen.
These windows can attached other types of windows (For this
case the Swype KB was attaching a PopupWinow which will be
of TYPE_APPLICATION). This causes the popup window app token
to be added to the list of apps to be hidden on the lock
screen, thereby preventing the lock screen from been hidden,
which then causes a layout cycle(s). Now, we remove app
tokens for non-app windows from the hidden list in case it
was added by any attached widow they migth have.

Also, when we are updating window animations, set the
hideWhenLocked flag for windows that are IME tragets so
they don't go through unneeded cycles of having their
visibility policy set to hide/show/hide/show/...

Bug: 18021493
Change-Id: I3680256d41793f62def42fda00e26db1dcc990cc