1. The window query API used to not-respect the root name space
while traversing the parent relation i.e. a client was able
to fetch the parent of a root name space node.
2. Children that are root name space were reported but their descendants
not. Actually such children should not be reported since they are
the root of a separate logical sub-tree. Such a tree is exposed by
its root allowing its traversal. The accessibility APIs should be
able to explore a virtual tree, i.e. one with a descendant which is
root name space, only if an accessibility event from there was received.
bug:5480096
Change-Id: I4c4d805aa2f6d4edba86eda213b5239bea83eed2
57f3b566db