Fix invalidation problem with display lists

It was previously the case that a view marked ~DRAWN must be
invalidated correctly already, so we would not mark any flags.
Display lists added new logic such that an undrawn node must still
be checked to see if its cache has been marked invalid. If not,
we must mark it invalid to make sure that a future rendering call
will cause the view to refresh its display list, thus refreshing its
child node tree's display lists, since that's where the invalidate
call must have originated.

Change-Id: I0f73c85459174c0e3f16d703f7eb914a706c808a