In AllInOneTetherSettings, we use TetherEnabler to hanle all behavior
related to tethering switch on/off.
In TetherEnbler, add WifiManager.WIFI_AP_STATE_CHANGED_ACTION to cover
all possible tethering state change.
TetherEnablerTest is modified accordingly.
Bug: 147322704
Test: make RunSettingsRoboTests ROBOTEST_FILTER=CodeInspectionTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=TetherEnablerTest
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=AllInOneTetherSettingsTest
Change-Id: I505b3825f79260983fff9d3935ba834ad8f9f690
These controllers are responsible for persisting preference values and
managing the visibility and switch state. TetherEnabler will be
listening to changes of shared prefernce values and turn on/off
corresponding type of tethering when tethering is on at that time.
Bug: 146582865
Test: tests are created for each controller class.
Change-Id: I7e601b2bd693da59269517d2988bade7475e7f12
