Add new "daily stats" tracking to battery stats.

Currently is only used for tracking the daily charge
and discharge rates.  We keep up to 10 days of data.

Change-Id: I54e29e35ff60d9277da9e476cdab22f4a6d540bf

parent b11be294

core/java/android/os/BatteryStats.java

+473 −105

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core/java/com/android/internal/os/BatteryStatsImpl.java

+369 −74

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services/core/java/com/android/server/am/BatteryStatsService.java

+18 −1

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