Reset stopwatches with bad data on first load

Bug: 34742962
Test: Manually create

There was a time when it was possible for a stopwatch with
negative elapsed time could be recorded. This bad data can
cause formatting exceptions in the new code. To avoid these
exceptions, the stopwatch is reset if it loaded in this bad state.

Change-Id: I5cdd287c96bd87a82876b7a8cb3643313045f667