Static overlays aren't changeable by a user. So we shouldn't list them
as a theme.
This CL fixed b/36812704 as well to run unit tests.
Test: building succeeded and tested on sailfish.
make RunSettingsRoboTests
adb shell am instrument -w -e class \
com.android.settings.display.ThemePreferenceControllerTest \
com.android.settings.tests.unit/android.support.test.runner.AndroidJUnitRunner
Bug: 37480890
Bug: 36812704
Change-Id: I8c13b6956083095dceaab3da6642bef1647d6a30
Add calls into the OverlayManagerService to update the overlays
directly and remove reboot dialog.
Test: make RunSettingsRobotTests
Change-Id: I92841e643eab70b4b194f60cce95ce3cedb75972
Fixes: 34701451