Correctly resize dialogs when measured in WRAP_CONTENT

Bug #2549649

If the window had a different size than its content but the content had already
been measured with the appropriate size, the window would not be resized. This
happens in wrap_content windows (dialogs.) This change simply adds a new codition
to window resizing: if the window is wrap_content, not as big as it can be and
not as big as its content, it gets resized.

Change-Id: I1d82d03af5a15c9ad8dffa0511d5f6d522578285