Fixed a few problems with the SensorService:
- a race condition when talking to the BatteryStatService
- only report changes to BatteryStatService when there are no errors
(ie: when a change actually happens)
- tell the BatteryStatService when a sensor is deactivated because its
client died
- rewrite enableSensor() so it's readable
- implement dump() so dumpsys will display some infos about active sensors
- recompute the delay properly when sensors are added/removed
This eliminates the requirement that all sensors share a single file descriptor.
This, along with concurrent changes in other projects, fixes bugs b/1614524 and b/1614481
Signed-off-by: Mike Lockwood <lockwood@android.com>
