Add calls into the OverlayManagerService to update the overlays
directly and remove reboot dialog.
Test: make RunSettingsRobotTests
Change-Id: I92841e643eab70b4b194f60cce95ce3cedb75972
Fixes: 34701451
When current theme is empty or null, set the summary to Default.
Change-Id: I1ede31952a09956a805e6ef09c0967ecdfa5051a
Fix: 34975969
Test: make RunSettingsRoboTests
The items been added to group are: Adaptive brightness, Sleep.
Battery saver has been moved into this group as well.
Also refactor the code a little bit to make it fit the
preferenceController. Whole refactor of PowerUsageSummary and
PowerUsageDetail will be tracked in b/34386721
Bug: 34279051
Test: runSettingsRoboTests & Screenshot
Change-Id: I702d8479d1b80f7e9cf1a46752c75bf5d189e0f6