Save battery slot diff data into database in hourly job. Then read the
saved diff data and only calculate the remaining data. This could speed
up the battery usage loading.
Bug: 261163071
Fix: 261163071
Test: manual
Change-Id: Icd4868ca9326b64b17ddbccdb0311e755dc68026
When two loaders started almost at the same time,
it is possible onLoadFinished is never called.
Bug: 256523472
Test: Unit tests passed and manual test on device
Change-Id: I41a041d5878f9930db44775408380d0d4588faba
Signed-off-by: Zhenwei Chen <zhenwec@google.com>