Examine widget hierarchy to find clocks.

When switching to a widget, examine its hierarchy to determine if it
contains TextClocks that show hour and minute for the local timezone.
If so, hide the status bar clock.  Doesn't fix closing walls.

Bug: 7667638
Change-Id: I1e2c40345c9e5eb0193efd70838c7ca9f779190b
4 files changed