Allow batteryChargeTimeToFullNowSeconds to be -1

Test: Run the test under an implementation that doesn't support
  batteryChargeTimeToFullNowSeconds
Bug: 166841711
Change-Id: I18fb11bb0a2233a9a89183a5f9ecf597e7719172
Merged-In: I18fb11bb0a2233a9a89183a5f9ecf597e7719172
(cherry picked from commit c2dc510a0aec6c88b370ab5f1eb41a7de1e64d67)
1 file changed