Jeff Sharkey d4ef8c8fc9 Clamp non-monotonic stats instead of dropping.
When encountering non-monotonic stats rows, recover remaining data by
clamping to 0.  In particular, this avoids edge-case where persisting
threshold checks would never trigger.  Also recover when tethering
snapshots are missing.

Bug: 5600785, 5433871, 5600678
Change-Id: I1871954ce3955cc4ac8846f9841bae0066176ffe
2011-11-10 17:54:23 -08:00
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