For better null safe.
Also add unit tests.
Fix: 290698845
Fix: 290684887
Test: unit test
Test: manual - on Mobile Settings page
Change-Id: I9c9edb9b7cbf7d688a885e5c36b61bd6dc526add
DataSaverController currently used in 2 pages,
- Network & internet > Data Saver
- Apps > Special app access
This helps unify the logic, and instead of showing on "Special app
access", this summary shows on "Unrestricted data" is make more sense.
Bug: 280280596
Test: Manually on above pages
Test: Unit test
Change-Id: Ia151ed8179a250f8f20cc5041f9383fffebdab10
Use AppListRepository instead of ApplicationsState can achieve better
performance.
Fix: 280280596
Test: Manually on Data Saver page
Test: Unit test
Change-Id: I98cbae50500b90e7e7f6101fb064003339b082c1
This used to by MByte and GByte, not used in other places in Settings,
and not align with the data summary on the same page.
Unify to MB and GB to align with other places in Settings and the data
summary on the same page.
Fix: 277900792
Test: Visual
Test: Unit test
Change-Id: I9f8ceac470aede135b7921c391c063ba87da661e
