Jeff Sharkey 7a1c3fce47 Accumulate network statistics based on deltas.
Network stats are now read out of the kernel in one sweep, instead of
reading per-UID.  We now accumulate the delta traffic between each
stats snapshot using the well-tested SamplingCounter pattern.

Since Wi-Fi and mobile traffic have different costs, track each
separately.  Avoids counting misc interfaces like loopback and
ethernet under total.

Bug: 5543387
Change-Id: I642004dc530113c27ef79f2abbae51d8af30117f
2013-06-06 14:35:34 -07:00
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