Fix issue #11199654: Action bar enter animation skips frames when cleared by the system

We have become too aggressive about not allowing windows to draw while windw
animations are running, basically not allowing any drawing in any window when
there is any window animation.  So if you did a relayout while the status bars
were being animated, your window would stop drawing until that status bar
animation was complete.

This change relaxes those rules in two ways:

- A particular window will only be told to stop updating when *it* is
  currently involved in a window animation.  So animations in status bars
  will not stop app windows from update, and vice versa.

- If a window receives input events while it is in the "do not update"
  state, we will immediately terminate that state and start allowing it to
  draw.  If the user is actually interacting with a window, we don't want
  to wait to show feedback.

Change-Id: I72574eec048aee53115b46a78686cf27f42c42f7