This fragment class is created to display Wifi tether settings, Usb
tether settings and bluetooth tether settings within the single "Hotspot &
tethering" screen. By creating a new fragemnt, we can safely change the
UI by replace fragment name in xml file.
Right now, it only supports wifi tether settings and mostly copied from
WifiTetherSettings.java.
Bug: 146447611
Test: AllInOneTetherSettingsTest is created and run.
Change-Id: Icdac0d4930451e6956dbf6ef0f4b65bce96fed3f
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
