base

Retrieve WiFi info outside of BatteryStatsImpl

In order to not deadlock the system, we need to retrieve
WiFi energy info outside of the BatteryStats lock. We do this,
then pass that data down to BatteryStatsImpl to process.

b/19729960

Change-Id: Ib8beba1d5ac81d89144d502c4b688d0a88c5b102