[Settings] Query historical data in background

Move the query of historical data into background thread to avoid from
blocking other query operation in UI thread,

Bug: 141833767
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=DataUsageSummaryPreferenceControllerTest
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=DataUsagePreferenceControllerTest
Change-Id: I61e414d70136a0025ddd7373a4f34a99acb89510
2 files changed