Improve GPS test.

Add a 5 second interval - this one is important to test new
LocationManager filtering code that kicks in between 1s and 10s
for GPS.

Add a passive provider listener, to verify the provider impl
is not doing much more work than it should (and just filtering
results in LocationManager).

Change-Id: I777c687b6037cb5fbb1bf1011bad331fec752c45